{"title":"Pond Liner Kits","description":"\u003cp\u003eEach pond liner kit pairs a liner with matching geotextile underlay, so you order both in one go at the right size. Choose from EPDM, butyl and LDPE kits, from small wildlife ponds up to heavy-duty 1.0mm EPDM koi pond builds. The wildlife pond starter kits also include pond sealer.\u003c\/p\u003e\u003cp\u003eNot sure what size you need? Use the \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003eliner calculator\u003c\/a\u003e to work out the liner and underlay size from your pond's length, width and depth.\u003c\/p\u003e","products":[{"product_id":"pond-liner-underlay-bundle-uk-epdm-0-75mm-200gsm-geotextile-complete-kit","title":"Pond Liner \u0026 Underlay Bundle UK | EPDM 0.75mm + 200gsm Geotextile | Complete Kit","description":"\u003ch2\u003eEPDM Rubber Pond Liner 0.75mm UK — Fish Safe | Lifetime Guarantee | Free UK Delivery\u003c\/h2\u003e\n\u003cp\u003eWhen it comes to pond liner materials, \u003cstrong\u003eEPDM rubber\u003c\/strong\u003e is the professional's first choice — and our \u003cstrong\u003e0.75mm EPDM Pond Liner\u003c\/strong\u003e is the UK's most popular choice for good reason. Flexible, fish-safe, UV-resistant, and backed by a Lifetime Guarantee, this is the liner trusted by garden designers, pond contractors, and DIY enthusiasts across the United Kingdom.\u003c\/p\u003e\n\u003cdiv class=\"plx-keyfacts\" style=\"border:1px solid #d7e3d7;border-left:4px solid #2d6a2d;border-radius:6px;padding:16px 20px;margin:20px 0;background:#f6faf6;\"\u003e\n\u003ch3 style=\"margin-top:0;\"\u003eEPDM Pond Liner and Underlay Bundle: Key Facts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiner:\u003c\/strong\u003e EPDM rubber, 0.75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnderlay:\u003c\/strong\u003e 200gsm geotextile, same size as the liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 6 sizes, from 3m x 3m to 8m x 6m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest for:\u003c\/strong\u003e Garden, wildlife, ornamental and goldfish ponds under 1.2m deep, as a complete liner and underlay kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuarantee:\u003c\/strong\u003e lifetime guarantee on the liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by:\u003c\/strong\u003e PondLinersco.co.uk (Express Matting Services Ltd, Burnley, Lancashire, UK)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eEPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber engineered specifically for outdoor applications. Unlike PVC liners that can become brittle over time, EPDM remains pliable for decades — maintaining its watertight integrity through the harshest UK winters and hottest summers without cracking, splitting, or degrading.\u003c\/p\u003e\n\u003ch3\u003eFull Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eEPDM Rubber (Ethylene Propylene Diene Monomer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e0.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-40°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent — lifetime stable, no degradation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish Safe\u003c\/td\u003e\n\u003ctd\u003e✅ Yes — certified safe for all fish species and aquatic life\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003eLifetime Guarantee on material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElongation at Break\u003c\/td\u003e\n\u003ctd\u003e300%+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexibility\u003c\/td\u003e\n\u003ctd\u003eExcellent — drapes and moulds to any pond contour\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eBlack (natural pond appearance)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOzone\/Chemical Resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5 Use Cases for EPDM 0.75mm Pond Liner\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🌿 \u003cstrong\u003eWildlife Garden Ponds\u003c\/strong\u003e — Create a thriving habitat for frogs, newts, dragonflies and hedgehogs. EPDM's flexible nature allows for gentle sloping edges that wildlife ponds require\u003c\/li\u003e\n\u003cli\u003e🐟 \u003cstrong\u003eGoldfish \u0026amp; Ornamental Fish Ponds\u003c\/strong\u003e — Fish safe for goldfish, shubunkins and other ornamental fish in ponds under 1.2m deep. For koi ponds, choose our \u003ca href=\"\/products\/koi-pond-professional-kit-uk-epdm-1-0mm-heavy-duty-premium-underlay\"\u003eKoi Pond Professional Kit\u003c\/a\u003e with 1.0mm heavy-duty EPDM instead\u003c\/li\u003e\n\u003cli\u003e💧 \u003cstrong\u003eStream Courses and Waterfalls\u003c\/strong\u003e — EPDM's flexibility allows it to be formed around complex stream courses, waterfalls, and cascades without creasing\u003c\/li\u003e\n\u003cli\u003e🌸 \u003cstrong\u003eFormal Ornamental Ponds\u003c\/strong\u003e — Clean black finish creates the reflective appearance preferred in formal garden design\u003c\/li\u003e\n\u003cli\u003e🌊 \u003cstrong\u003eNatural-Style Garden Ponds\u003c\/strong\u003e — Available in sizes from 3m x 3m up to 8m x 6m for natural-style garden ponds under 1.2m deep\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-Step Installation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcavate and prepare\u003c\/strong\u003e — Dig your pond to desired shape, incorporating shelf areas at 25–30cm depth for marginal plants. Remove all stones, roots, and sharp debris from all surfaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall underlay\u003c\/strong\u003e — Lay a 200gsm geotextile underlay before the EPDM liner — this is essential to protect the liner from punctures. Press flat against all surfaces with 30cm edge overlap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarm and position the liner\u003c\/strong\u003e — On a warm, sunny day, unfold the EPDM liner and allow it to warm for 30 minutes — warmer EPDM is more pliable and easier to mould. Centre over the pond\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMould to shape\u003c\/strong\u003e — Gently press the liner into the pond contours, creating neat pleats at corners. Work from the centre outward. Do not stretch excessively\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFill and secure\u003c\/strong\u003e — Begin filling with water slowly. As weight builds, the liner will settle perfectly. Trim excess liner, leaving 30cm edge, and secure under coping stones or turf\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eWhy Choose EPDM Over PVC or HDPE?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs PVC:\u003c\/strong\u003e EPDM remains flexible indefinitely. PVC can become brittle after years of UV exposure. EPDM has a proven 40+ year lifespan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs HDPE:\u003c\/strong\u003e EPDM is far more flexible and easier to install in irregular pond shapes. EPDM joins can be cold-bonded with tape; HDPE requires heat welding\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs Butyl:\u003c\/strong\u003e EPDM offers similar performance to Butyl at a more accessible price point — making it the top choice for value-conscious pond builders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Tested and approved safe for all fish species including koi and goldfish\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — Free delivery to all mainland UK addresses\u003c\/li\u003e\n\u003cli\u003e✅ Lifetime Guarantee — Manufacturer's lifetime guarantee on material integrity\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Call our pond specialists for free sizing and installation advice\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I calculate the liner size I need?\u003c\/strong\u003e\u003cbr\u003eA: Liner Length = Pond Length + (2 × Max Depth) + 0.6m; Liner Width = Pond Width + (2 × Max Depth) + 0.6m. Always round up to the next available size.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can EPDM be repaired if it gets a puncture?\u003c\/strong\u003e\u003cbr\u003eA: Yes. EPDM is one of the easiest liner materials to repair. Small punctures can be patched with EPDM repair tape in under 30 minutes. The pond doesn't need to be fully drained for minor repairs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is EPDM safe for plants as well as fish?\u003c\/strong\u003e\u003cbr\u003eA: Absolutely. EPDM is 100% inert and does not leach any chemicals into the water. It is safe for fish, aquatic plants, amphibians, and all pond wildlife.\u003c\/p\u003e\n\u003ch3\u003eHow Much Liner Do I Need?\u003c\/h3\u003e\n\u003cp\u003eMeasure the longest length, the widest width and the deepest point of the pond, then for each direction:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLiner length = pond length + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eLiner width = pond width + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe extra 0.6m gives a 30cm overlap on every edge for anchoring. Round up to the next available size; sizes work either way round.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExample:\u003c\/strong\u003e a 3m x 2m pond, 0.6m deep, needs at least 4.8m x 3.8m, so choose the \u003cstrong\u003e5m x 4m\u003c\/strong\u003e size.\u003c\/p\u003e\n\u003cp\u003eNot sure? Use the \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003epond liner size calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eEPDM Pond Liner and Underlay Bundle: Questions Answered\u003c\/h3\u003e\n\u003ch4\u003eWhat size EPDM Pond Liner and Underlay Bundle do I need for a 3m x 2m pond?\u003c\/h4\u003e\n\u003cp\u003eFor a 3m x 2m pond that is 0.6m deep you need at least 4.8m x 3.8m, so choose the 5m x 4m size. The formula is pond length (or width) + (2 x maximum depth) + 0.6m.\u003c\/p\u003e\n\u003ch4\u003eIs underlay included?\u003c\/h4\u003e\n\u003cp\u003eYes. Underlay is included in this listing. Lay it over the prepared, stone-free base first, then lay the liner on top.\u003c\/p\u003e\n\u003ch4\u003eHow thick is the EPDM Pond Liner and Underlay Bundle?\u003c\/h4\u003e\n\u003cp\u003eThe liner is 0.75mm thick.\u003c\/p\u003e\n\u003ch4\u003eHow many sizes are available?\u003c\/h4\u003e\n\u003cp\u003eThere are 6 sizes, from 3m x 3m to 8m x 6m.\u003c\/p\u003e\n\u003ch3\u003eHelpful Guides\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-choosing\"\u003eHow to choose a pond liner: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-sizing\"\u003ePond liner sizing: measure and order the right size\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-installation\"\u003ePond liner installation: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-materials\"\u003ePond liner materials compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/epdm-pond-liners\"\u003eEPDM pond liners\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"PondLiners Co","offers":[{"title":"3m x 3m","offer_id":57665555956060,"sku":"PLC-KIT-EPDM075-3X3","price":220.99,"currency_code":"GBP","in_stock":true},{"title":"4m x 3m","offer_id":57665555988828,"sku":"PLC-KIT-EPDM075-4X3","price":295.99,"currency_code":"GBP","in_stock":true},{"title":"5m x 4m","offer_id":57665556021596,"sku":"PLC-KIT-EPDM075-5X4","price":490.99,"currency_code":"GBP","in_stock":true},{"title":"6m x 5m","offer_id":57665556054364,"sku":"PLC-KIT-EPDM075-6X5","price":735.99,"currency_code":"GBP","in_stock":true},{"title":"7m x 6m","offer_id":57665556087132,"sku":"PLC-KIT-EPDM075-7X6","price":1048.99,"currency_code":"GBP","in_stock":true},{"title":"8m x 6m","offer_id":57665556119900,"sku":"PLC-KIT-EPDM075-8X6","price":1176.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/epdm-pond-liner-and-underlay-bundle-contractors-installing.jpg?v=1791112050"},{"product_id":"complete-pond-liner-kit-uk-butyl-0-75mm-geotextile-underlay-premium-bundle","title":"Complete Pond Liner Kit UK | Butyl 0.75mm + Geotextile Underlay | Premium Bundle","description":"\u003ch2\u003eComplete Pond Liner Kit UK — Butyl 0.75mm + Geotextile Underlay | Premium Bundle\u003c\/h2\u003e\n\u003cp\u003eOur Complete Pond Liner Kit pairs a 0.75mm butyl rubber pond liner with a matching geotextile underlay, so the liner and its protective cushion layer arrive together. Professional pond builders consider underlay non-negotiable: a pond liner without underlay is a pond liner waiting to fail.\u003c\/p\u003e\n\u003cdiv class=\"plx-keyfacts\" style=\"border:1px solid #d7e3d7;border-left:4px solid #2d6a2d;border-radius:6px;padding:16px 20px;margin:20px 0;background:#f6faf6;\"\u003e\n\u003ch3 style=\"margin-top:0;\"\u003eButyl Pond Liner Kit: Key Facts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiner:\u003c\/strong\u003e Butyl rubber, 0.75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnderlay:\u003c\/strong\u003e geotextile underlay, supplied with the liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 6 sizes, from 3m x 3m to 8m x 6m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest for:\u003c\/strong\u003e Garden, koi and wildlife ponds, as a complete liner and underlay kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by:\u003c\/strong\u003e PondLinersco.co.uk (Express Matting Services Ltd, Burnley, Lancashire, UK)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eOur geotextile underlay is a heavy-duty 200gsm needle-punched polypropylene fabric — the same professional specification used in commercial reservoir lining, landscape drainage, and civil engineering projects. It acts as a cushion between the ground and your pond liner, absorbing the shock of stones, roots, and ground movement that would otherwise puncture or stress your investment over time.\u003c\/p\u003e\n\u003ch3\u003eFull Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eButyl rubber liner (0.75mm) with geotextile underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e200gsm (grams per square metre)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e0.75mm butyl liner; underlay approximately 2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-30°C to +70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Resistance\u003c\/td\u003e\n\u003ctd\u003eGood (protected by liner once installed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish Safe\u003c\/td\u003e\n\u003ctd\u003e✅ Yes — inert polypropylene, non-toxic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003e20 years on the geotextile underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eButyl liner and underlay supplied as a matched set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Permeability\u003c\/td\u003e\n\u003ctd\u003eHigh — allows drainage, does not trap water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eGrey underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5 Reasons Underlay Is Essential\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eStone Puncture Protection\u003c\/strong\u003e — Even carefully prepared ground contains sharp stones that can work upward through soil movement. Underlay provides a tough buffer preventing these from reaching your liner\u003c\/li\u003e\n\u003cli\u003e🌱 \u003cstrong\u003eRoot Penetration Barrier\u003c\/strong\u003e — Aquatic plant roots can penetrate most liner materials over time. 200gsm geotextile significantly reduces this risk\u003c\/li\u003e\n\u003cli\u003e🌡️ \u003cstrong\u003eThermal Insulation\u003c\/strong\u003e — Provides a layer of insulation beneath the liner, helping maintain more stable water temperatures in winter\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eGround Movement Cushioning\u003c\/strong\u003e — Soils expand and contract with moisture changes and frost. Underlay absorbs this movement, preventing it from stressing the liner\u003c\/li\u003e\n\u003cli\u003e⏰ \u003cstrong\u003eExtended Liner Life\u003c\/strong\u003e — Pond liners installed with geotextile underlay last significantly longer than those without. The underlay investment pays for itself many times over\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-Step Installation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcavate and clean\u003c\/strong\u003e — Dig your pond and remove all large stones, roots, glass, and sharp debris. The cleaner the substrate, the better\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoll out the underlay\u003c\/strong\u003e — Starting from one end, roll the underlay fabric into the excavation and press flat against all surfaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap at edges\u003c\/strong\u003e — Allow 30–40cm of underlay to extend beyond the pond edge in all directions, protecting the liner at its most vulnerable point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap joins\u003c\/strong\u003e — If multiple pieces are needed, overlap by at least 300mm. No adhesive needed — the liner weight holds all pieces in position\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall liner on top\u003c\/strong\u003e — The 0.75mm butyl liner in this kit is installed directly on top of the underlay. The two layers work together to provide optimal protection\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eCompatible With All Pond Liner Types\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ EPDM Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ Butyl Rubber Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ PVC Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ HDPE Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ LDPE Pond Liner — all grades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Inert polypropylene, safe for all aquatic life\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — All mainland UK orders delivered free\u003c\/li\u003e\n\u003cli\u003e✅ 20 Year Guarantee on the underlay — Long-term fabric warranty\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Our team can help calculate the exact quantity needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I really need underlay, or can I use sand instead?\u003c\/strong\u003e\u003cbr\u003eA: Sand is a good supplement but not a replacement for geotextile underlay. Sand can be washed away by water movement during pond filling, leaving voids that create pressure points. Use both sand (50mm base layer) AND geotextile underlay for the best protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How much underlay do I need?\u003c\/strong\u003e\u003cbr\u003eA: Order the same dimensions as your pond liner. The underlay in this kit is supplied in the same size as the liner, so no extra is needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can underlay be used for other applications?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Our 200gsm geotextile is widely used for weed suppression in garden borders, drainage separation layers in decking and paving projects, and erosion control on slopes.\u003c\/p\u003e\n\u003ch3\u003eHow Much Liner Do I Need?\u003c\/h3\u003e\n\u003cp\u003eMeasure the longest length, the widest width and the deepest point of the pond, then for each direction:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLiner length = pond length + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eLiner width = pond width + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe extra 0.6m gives a 30cm overlap on every edge for anchoring. Round up to the next available size; sizes work either way round.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExample:\u003c\/strong\u003e a 3m x 2m pond, 0.6m deep, needs at least 4.8m x 3.8m, so choose the \u003cstrong\u003e5m x 4m\u003c\/strong\u003e size.\u003c\/p\u003e\n\u003cp\u003eNot sure? Use the \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003epond liner size calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eButyl Pond Liner Kit: Questions Answered\u003c\/h3\u003e\n\u003ch4\u003eWhat size Butyl Pond Liner Kit do I need for a 3m x 2m pond?\u003c\/h4\u003e\n\u003cp\u003eFor a 3m x 2m pond that is 0.6m deep you need at least 4.8m x 3.8m, so choose the 5m x 4m size. The formula is pond length (or width) + (2 x maximum depth) + 0.6m.\u003c\/p\u003e\n\u003ch4\u003eIs underlay included?\u003c\/h4\u003e\n\u003cp\u003eYes. Underlay is included in this listing. Lay it over the prepared, stone-free base first, then lay the liner on top.\u003c\/p\u003e\n\u003ch4\u003eHow thick is the Butyl Pond Liner Kit?\u003c\/h4\u003e\n\u003cp\u003eThe liner is 0.75mm thick.\u003c\/p\u003e\n\u003ch4\u003eHow many sizes are available?\u003c\/h4\u003e\n\u003cp\u003eThere are 6 sizes, from 3m x 3m to 8m x 6m.\u003c\/p\u003e\n\u003ch3\u003eHelpful Guides\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-choosing\"\u003eHow to choose a pond liner: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-sizing\"\u003ePond liner sizing: measure and order the right size\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-installation\"\u003ePond liner installation: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-materials\"\u003ePond liner materials compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/butyl-pond-liners\"\u003eButyl pond liners\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"PondLiners Co","offers":[{"title":"3m x 3m","offer_id":57665556152668,"sku":"PLC-KIT-BUTYL075-3X3","price":220.99,"currency_code":"GBP","in_stock":true},{"title":"4m x 3m","offer_id":57665556185436,"sku":"PLC-KIT-BUTYL075-4X3","price":295.99,"currency_code":"GBP","in_stock":true},{"title":"5m x 4m","offer_id":57665556218204,"sku":"PLC-KIT-BUTYL075-5X4","price":490.99,"currency_code":"GBP","in_stock":true},{"title":"6m x 5m","offer_id":57665556250972,"sku":"PLC-KIT-BUTYL075-6X5","price":735.99,"currency_code":"GBP","in_stock":true},{"title":"7m x 6m","offer_id":57665556283740,"sku":"PLC-KIT-BUTYL075-7X6","price":1048.99,"currency_code":"GBP","in_stock":true},{"title":"8m x 6m","offer_id":57665556316508,"sku":"PLC-KIT-BUTYL075-8X6","price":1176.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/butyl-pond-liner-kit-crew-installing-over-underlay-estate-pond.jpg?v=1791112052"},{"product_id":"wildlife-pond-starter-kit-uk-ldpe-liner-underlay-pond-sealer-all-in-one","title":"Wildlife Pond Starter Kit UK | LDPE Liner + Underlay + Pond Sealer | All-in-One","description":"\u003ch2\u003eWildlife Pond Starter Kit UK — LDPE Liner + Underlay + Pond Sealer | All-in-One\u003c\/h2\u003e\n\u003cp\u003eOur Wildlife Pond Starter Kit brings together an LDPE pond liner, a matching underlay and pond sealer, so everything needed to line a new wildlife pond arrives in one order. Professional pond builders consider underlay non-negotiable: a pond liner without underlay is a pond liner waiting to fail.\u003c\/p\u003e\n\u003cdiv class=\"plx-keyfacts\" style=\"border:1px solid #d7e3d7;border-left:4px solid #2d6a2d;border-radius:6px;padding:16px 20px;margin:20px 0;background:#f6faf6;\"\u003e\n\u003ch3 style=\"margin-top:0;\"\u003eWildlife Pond Starter Kit (LDPE): Key Facts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiner:\u003c\/strong\u003e LDPE pond liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnderlay:\u003c\/strong\u003e geotextile underlay\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso included:\u003c\/strong\u003e pond sealer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 4 sizes, from 3m x 3m to 6m x 5m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest for:\u003c\/strong\u003e Starting a new wildlife pond\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by:\u003c\/strong\u003e PondLinersco.co.uk (Express Matting Services Ltd, Burnley, Lancashire, UK)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eOur geotextile underlay is a heavy-duty 200gsm needle-punched polypropylene fabric — the same professional specification used in commercial reservoir lining, landscape drainage, and civil engineering projects. It acts as a cushion between the ground and your pond liner, absorbing the shock of stones, roots, and ground movement that would otherwise puncture or stress your investment over time.\u003c\/p\u003e\n\u003ch3\u003eFull Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eLDPE liner with geotextile underlay and pond sealer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e200gsm (grams per square metre)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003eLDPE liner; underlay approximately 2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-30°C to +70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Resistance\u003c\/td\u003e\n\u003ctd\u003eGood (protected by liner once installed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish Safe\u003c\/td\u003e\n\u003ctd\u003e✅ Yes — inert polypropylene, non-toxic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003e20 years on the geotextile underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eLDPE liner, underlay and pond sealer supplied as a kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Permeability\u003c\/td\u003e\n\u003ctd\u003eHigh — allows drainage, does not trap water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eGrey underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5 Reasons Underlay Is Essential\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eStone Puncture Protection\u003c\/strong\u003e — Even carefully prepared ground contains sharp stones that can work upward through soil movement. Underlay provides a tough buffer preventing these from reaching your liner\u003c\/li\u003e\n\u003cli\u003e🌱 \u003cstrong\u003eRoot Penetration Barrier\u003c\/strong\u003e — Aquatic plant roots can penetrate most liner materials over time. 200gsm geotextile significantly reduces this risk\u003c\/li\u003e\n\u003cli\u003e🌡️ \u003cstrong\u003eThermal Insulation\u003c\/strong\u003e — Provides a layer of insulation beneath the liner, helping maintain more stable water temperatures in winter\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eGround Movement Cushioning\u003c\/strong\u003e — Soils expand and contract with moisture changes and frost. Underlay absorbs this movement, preventing it from stressing the liner\u003c\/li\u003e\n\u003cli\u003e⏰ \u003cstrong\u003eExtended Liner Life\u003c\/strong\u003e — Pond liners installed with geotextile underlay last significantly longer than those without. The underlay investment pays for itself many times over\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-Step Installation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcavate and clean\u003c\/strong\u003e — Dig your pond and remove all large stones, roots, glass, and sharp debris. The cleaner the substrate, the better\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoll out the underlay\u003c\/strong\u003e — Starting from one end, roll the underlay fabric into the excavation and press flat against all surfaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap at edges\u003c\/strong\u003e — Allow 30–40cm of underlay to extend beyond the pond edge in all directions, protecting the liner at its most vulnerable point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap joins\u003c\/strong\u003e — If multiple pieces are needed, overlap by at least 300mm. No adhesive needed — the liner weight holds all pieces in position\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall liner on top\u003c\/strong\u003e — The LDPE liner in this kit is installed directly on top of the underlay. The two layers work together to provide optimal protection\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eCompatible With All Pond Liner Types\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ EPDM Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ Butyl Rubber Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ PVC Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ HDPE Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ LDPE Pond Liner — all grades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Inert polypropylene, safe for all aquatic life\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — All mainland UK orders delivered free\u003c\/li\u003e\n\u003cli\u003e✅ 20 Year Guarantee on the underlay — Long-term fabric warranty\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Our team can help calculate the exact quantity needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I really need underlay, or can I use sand instead?\u003c\/strong\u003e\u003cbr\u003eA: Sand is a good supplement but not a replacement for geotextile underlay. Sand can be washed away by water movement during pond filling, leaving voids that create pressure points. Use both sand (50mm base layer) AND geotextile underlay for the best protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How much underlay do I need?\u003c\/strong\u003e\u003cbr\u003eA: Order the same dimensions as your pond liner. The underlay in this kit is supplied in the same size as the liner, so no extra is needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can underlay be used for other applications?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Our 200gsm geotextile is widely used for weed suppression in garden borders, drainage separation layers in decking and paving projects, and erosion control on slopes.\u003c\/p\u003e\n\u003ch3\u003eHow Much Liner Do I Need?\u003c\/h3\u003e\n\u003cp\u003eMeasure the longest length, the widest width and the deepest point of the pond, then for each direction:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLiner length = pond length + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eLiner width = pond width + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe extra 0.6m gives a 30cm overlap on every edge for anchoring. Round up to the next available size; sizes work either way round.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExample:\u003c\/strong\u003e a 3m x 2m pond, 0.6m deep, needs at least 4.8m x 3.8m, so choose the \u003cstrong\u003e5m x 4m\u003c\/strong\u003e size.\u003c\/p\u003e\n\u003cp\u003eNot sure? Use the \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003epond liner size calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWildlife Pond Starter Kit (LDPE): Questions Answered\u003c\/h3\u003e\n\u003ch4\u003eWhat size Wildlife Pond Starter Kit (LDPE) do I need for a 3m x 2m pond?\u003c\/h4\u003e\n\u003cp\u003eFor a 3m x 2m pond that is 0.6m deep you need at least 4.8m x 3.8m, so choose the 5m x 4m size. The formula is pond length (or width) + (2 x maximum depth) + 0.6m.\u003c\/p\u003e\n\u003ch4\u003eIs underlay included?\u003c\/h4\u003e\n\u003cp\u003eYes. Underlay is included in this listing. Lay it over the prepared, stone-free base first, then lay the liner on top.\u003c\/p\u003e\n\u003ch4\u003eHow many sizes are available?\u003c\/h4\u003e\n\u003cp\u003eThere are 4 sizes, from 3m x 3m to 6m x 5m.\u003c\/p\u003e\n\u003ch3\u003eHelpful Guides\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-choosing\"\u003eHow to choose a pond liner: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-sizing\"\u003ePond liner sizing: measure and order the right size\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-installation\"\u003ePond liner installation: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-materials\"\u003ePond liner materials compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-koi-wildlife\"\u003eKoi and wildlife pond liners\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/ldpe-pond-liners\"\u003eLDPE pond liners\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"PondLiners Co","offers":[{"title":"3m x 3m","offer_id":57665556349276,"sku":"PLC-KIT-WILD-LDPE-3X3","price":70.0,"currency_code":"GBP","in_stock":true},{"title":"4m x 3m","offer_id":57665556382044,"sku":"PLC-KIT-WILD-LDPE-4X3","price":88.33,"currency_code":"GBP","in_stock":true},{"title":"5m x 4m","offer_id":57665556414812,"sku":"PLC-KIT-WILD-LDPE-5X4","price":137.22,"currency_code":"GBP","in_stock":true},{"title":"6m x 5m","offer_id":57665556447580,"sku":"PLC-KIT-WILD-LDPE-6X5","price":198.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/9109263f25bb4ddb99112d2994f1059f_d25a1458-00af-4f36-adc5-15ee590343bc.jpg?v=1779040485"},{"product_id":"wildlife-pond-starter-kit-uk-epdm-liner-underlay-pond-sealer","title":"Wildlife Pond Starter Kit UK | EPDM Liner + Underlay + Pond Sealer","description":"\u003ch2\u003eWildlife Pond Starter Kit UK — EPDM Liner + Underlay + Pond Sealer\u003c\/h2\u003e\n\u003cp\u003eOur Wildlife Pond Starter Kit brings together an EPDM pond liner, a matching underlay and pond sealer, so everything needed to line a new wildlife pond arrives in one order. Professional pond builders consider underlay non-negotiable: a pond liner without underlay is a pond liner waiting to fail.\u003c\/p\u003e\n\u003cdiv class=\"plx-keyfacts\" style=\"border:1px solid #d7e3d7;border-left:4px solid #2d6a2d;border-radius:6px;padding:16px 20px;margin:20px 0;background:#f6faf6;\"\u003e\n\u003ch3 style=\"margin-top:0;\"\u003eWildlife Pond Starter Kit (EPDM): Key Facts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiner:\u003c\/strong\u003e EPDM rubber pond liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnderlay:\u003c\/strong\u003e geotextile underlay\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso included:\u003c\/strong\u003e pond sealer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 4 sizes, from 3m x 3m to 6m x 5m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest for:\u003c\/strong\u003e Starting a new wildlife pond\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by:\u003c\/strong\u003e PondLinersco.co.uk (Express Matting Services Ltd, Burnley, Lancashire, UK)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eOur geotextile underlay is a heavy-duty 200gsm needle-punched polypropylene fabric — the same professional specification used in commercial reservoir lining, landscape drainage, and civil engineering projects. It acts as a cushion between the ground and your pond liner, absorbing the shock of stones, roots, and ground movement that would otherwise puncture or stress your investment over time.\u003c\/p\u003e\n\u003ch3\u003eFull Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eEPDM rubber liner with geotextile underlay and pond sealer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e200gsm (grams per square metre)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003eEPDM liner; underlay approximately 2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-30°C to +70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Resistance\u003c\/td\u003e\n\u003ctd\u003eGood (protected by liner once installed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish Safe\u003c\/td\u003e\n\u003ctd\u003e✅ Yes — inert polypropylene, non-toxic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003e20 years on the geotextile underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eEPDM liner, underlay and pond sealer supplied as a kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Permeability\u003c\/td\u003e\n\u003ctd\u003eHigh — allows drainage, does not trap water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eGrey underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5 Reasons Underlay Is Essential\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eStone Puncture Protection\u003c\/strong\u003e — Even carefully prepared ground contains sharp stones that can work upward through soil movement. Underlay provides a tough buffer preventing these from reaching your liner\u003c\/li\u003e\n\u003cli\u003e🌱 \u003cstrong\u003eRoot Penetration Barrier\u003c\/strong\u003e — Aquatic plant roots can penetrate most liner materials over time. 200gsm geotextile significantly reduces this risk\u003c\/li\u003e\n\u003cli\u003e🌡️ \u003cstrong\u003eThermal Insulation\u003c\/strong\u003e — Provides a layer of insulation beneath the liner, helping maintain more stable water temperatures in winter\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eGround Movement Cushioning\u003c\/strong\u003e — Soils expand and contract with moisture changes and frost. Underlay absorbs this movement, preventing it from stressing the liner\u003c\/li\u003e\n\u003cli\u003e⏰ \u003cstrong\u003eExtended Liner Life\u003c\/strong\u003e — Pond liners installed with geotextile underlay last significantly longer than those without. The underlay investment pays for itself many times over\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-Step Installation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcavate and clean\u003c\/strong\u003e — Dig your pond and remove all large stones, roots, glass, and sharp debris. The cleaner the substrate, the better\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoll out the underlay\u003c\/strong\u003e — Starting from one end, roll the underlay fabric into the excavation and press flat against all surfaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap at edges\u003c\/strong\u003e — Allow 30–40cm of underlay to extend beyond the pond edge in all directions, protecting the liner at its most vulnerable point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap joins\u003c\/strong\u003e — If multiple pieces are needed, overlap by at least 300mm. No adhesive needed — the liner weight holds all pieces in position\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall liner on top\u003c\/strong\u003e — The EPDM liner in this kit is installed directly on top of the underlay. The two layers work together to provide optimal protection\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eCompatible With All Pond Liner Types\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ EPDM Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ Butyl Rubber Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ PVC Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ HDPE Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ LDPE Pond Liner — all grades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Inert polypropylene, safe for all aquatic life\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — All mainland UK orders delivered free\u003c\/li\u003e\n\u003cli\u003e✅ 20 Year Guarantee on the underlay — Long-term fabric warranty\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Our team can help calculate the exact quantity needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I really need underlay, or can I use sand instead?\u003c\/strong\u003e\u003cbr\u003eA: Sand is a good supplement but not a replacement for geotextile underlay. Sand can be washed away by water movement during pond filling, leaving voids that create pressure points. Use both sand (50mm base layer) AND geotextile underlay for the best protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How much underlay do I need?\u003c\/strong\u003e\u003cbr\u003eA: Order the same dimensions as your pond liner. The underlay in this kit is supplied in the same size as the liner, so no extra is needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can underlay be used for other applications?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Our 200gsm geotextile is widely used for weed suppression in garden borders, drainage separation layers in decking and paving projects, and erosion control on slopes.\u003c\/p\u003e\n\u003ch3\u003eHow Much Liner Do I Need?\u003c\/h3\u003e\n\u003cp\u003eMeasure the longest length, the widest width and the deepest point of the pond, then for each direction:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLiner length = pond length + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eLiner width = pond width + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe extra 0.6m gives a 30cm overlap on every edge for anchoring. Round up to the next available size; sizes work either way round.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExample:\u003c\/strong\u003e a 3m x 2m pond, 0.6m deep, needs at least 4.8m x 3.8m, so choose the \u003cstrong\u003e5m x 4m\u003c\/strong\u003e size.\u003c\/p\u003e\n\u003cp\u003eNot sure? Use the \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003epond liner size calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWildlife Pond Starter Kit (EPDM): Questions Answered\u003c\/h3\u003e\n\u003ch4\u003eWhat size Wildlife Pond Starter Kit (EPDM) do I need for a 3m x 2m pond?\u003c\/h4\u003e\n\u003cp\u003eFor a 3m x 2m pond that is 0.6m deep you need at least 4.8m x 3.8m, so choose the 5m x 4m size. The formula is pond length (or width) + (2 x maximum depth) + 0.6m.\u003c\/p\u003e\n\u003ch4\u003eIs underlay included?\u003c\/h4\u003e\n\u003cp\u003eYes. Underlay is included in this listing. Lay it over the prepared, stone-free base first, then lay the liner on top.\u003c\/p\u003e\n\u003ch4\u003eHow many sizes are available?\u003c\/h4\u003e\n\u003cp\u003eThere are 4 sizes, from 3m x 3m to 6m x 5m.\u003c\/p\u003e\n\u003ch3\u003eHelpful Guides\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-choosing\"\u003eHow to choose a pond liner: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-sizing\"\u003ePond liner sizing: measure and order the right size\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-installation\"\u003ePond liner installation: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-materials\"\u003ePond liner materials compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-koi-wildlife\"\u003eKoi and wildlife pond liners\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/epdm-pond-liners\"\u003eEPDM pond liners\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"PondLiners Co","offers":[{"title":"3x3m","offer_id":57665829273948,"sku":"PLC-KIT-WILD-EPDM-3X3","price":220.99,"currency_code":"GBP","in_stock":true},{"title":"4x3m","offer_id":57665829306716,"sku":"PLC-KIT-WILD-EPDM-4X3","price":295.99,"currency_code":"GBP","in_stock":true},{"title":"5x4m","offer_id":57665829339484,"sku":"PLC-KIT-WILD-EPDM-5X4","price":490.99,"currency_code":"GBP","in_stock":true},{"title":"6x5m","offer_id":57665829372252,"sku":"PLC-KIT-WILD-EPDM-6X5","price":735.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/Wildlife_Pond_Starter_Kit_UK_EPDM_Liner_Underlay_Pond_Sealer.jpg?v=1779715477"},{"product_id":"koi-pond-professional-kit-uk-epdm-1-0mm-heavy-duty-premium-underlay","title":"Koi Pond Professional Kit UK | 1.0mm EPDM Heavy Duty Liner + 200gsm Underlay","description":"\u003ch2\u003eKoi Pond Professional Kit: 1.0mm EPDM Rubber Liner + 200gsm Underlay\u003c\/h2\u003e\n\u003cp\u003eBuilding a koi pond means digging deep, lining once and living with the result for decades. This kit gives you the two layers that matter most: a 1.0mm heavy duty EPDM rubber pond liner and a matching 200gsm geotextile underlay, cut to the same size and supplied together. 1.0mm EPDM is the specification chosen by professional pond contractors, koi breeders and serious pond keepers across the UK, because it is a third thicker than standard 0.75mm liner. Choose from 17 sizes, from 5m x 4m up to 10m x 10m, to suit ponds of 1.2m depth and more.\u003c\/p\u003e\n\u003cdiv class=\"plx-keyfacts\" style=\"border:1px solid #d7e3d7;border-left:4px solid #2d6a2d;border-radius:6px;padding:16px 20px;margin:20px 0;background:#f6faf6;\"\u003e\n\u003ch3 style=\"margin-top:0;\"\u003eKoi Pond Professional Kit: Key Facts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiner:\u003c\/strong\u003e EPDM synthetic rubber, 1.0mm thick, black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnderlay:\u003c\/strong\u003e 200gsm needle-punched geotextile, included in the same size\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 17 sizes, from 5m x 4m to 12m x 8m and 10m x 10m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuarantee:\u003c\/strong\u003e Lifetime Guarantee on the liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest for:\u003c\/strong\u003e Koi ponds, which are deep and need a tough, fish-safe liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by:\u003c\/strong\u003e PondLinersco.co.uk (Express Matting Services Ltd, Burnley, Lancashire, UK)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhy 1.0mm EPDM works for koi\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eThickness where it counts.\u003c\/strong\u003e A koi pond holds many tonnes of water, so every stone or root under the liner is pressed hard against it. The extra material in a 1.0mm sheet spreads that load and resists puncturing better than thinner liners, especially on stony ground or where rockwork and coping sit on the edge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRubber that moves with the ground.\u003c\/strong\u003e EPDM is an elastic synthetic rubber. It stretches into corners and over shelves, and it copes with ground settlement and winter freezing without cracking, which stiffer plastic liners can struggle with.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSafe for fish, stable in sunlight.\u003c\/strong\u003e The liner is made with 100% EPDM polymer. It is inert in water, so it does not leach into the pond, and it stands up to UV and weathering, which is why the same material is used to waterproof roofs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUnderlay that is matched, not forgotten.\u003c\/strong\u003e The 200gsm geotextile goes down first and protects the liner from below. Because it arrives in the same size, you are not left measuring and ordering a second product.\u003c\/p\u003e\n\u003ch3\u003eWhere it is used\u003c\/h3\u003e\n\u003cp\u003eThe kit suits formal and informal koi ponds, deep goldfish and sturgeon ponds, raised koi ponds built in blockwork or timber with the liner inside, and ponds with filter chambers and bottom drains planned in.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLiner material\u003c\/td\u003e\n\u003ctd\u003eEPDM synthetic rubber (100% EPDM polymer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLiner thickness\u003c\/td\u003e\n\u003ctd\u003e1.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLiner colour\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003eLifetime Guarantee (liner)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish\/Koi Safe\u003c\/td\u003e\n\u003ctd\u003eYes. Inert EPDM rubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnderlay\u003c\/td\u003e\n\u003ctd\u003e200gsm needle-punched non-woven geotextile, grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnderlay size\u003c\/td\u003e\n\u003ctd\u003eSame as the liner (0.5m larger on the 5.5m sizes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSizes\u003c\/td\u003e\n\u003ctd\u003e17 sizes, 5m x 4m to 10m x 10m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003eNot published for this line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003eChoosing the right size\u003c\/h3\u003e\n\u003cp\u003eMeasure the longest length, the widest width and the deepest point of the pond. For each direction:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLiner length = pond length + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eLiner width = pond width + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 0.6m gives a 30cm overlap on every edge for anchoring under coping. Round up to the next size; sizes work either way round. The table shows the largest pond each kit covers at 1.2m and 1.5m deep, assuming straight sides. Shelves and sloping sides reduce the volume, so treat the litres as an upper limit. A common rule of thumb is about 1,000 litres per adult koi.\u003c\/p\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eKit size\u003c\/th\u003e\n\u003cth\u003eUnderlay\u003c\/th\u003e\n\u003cth\u003eMax pond at 1.2m deep\u003c\/th\u003e\n\u003cth\u003eApprox. litres at 1.2m\u003c\/th\u003e\n\u003cth\u003eMax pond at 1.5m deep\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5m x 4m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e2 m x 1 m\u003c\/td\u003e\n\u003ctd\u003e2,400\u003c\/td\u003e\n\u003ctd\u003etoo small\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5.5m x 4m\u003c\/td\u003e\n\u003ctd\u003e6m x 4m (trim to fit)\u003c\/td\u003e\n\u003ctd\u003e2.5 m x 1 m\u003c\/td\u003e\n\u003ctd\u003e3,000\u003c\/td\u003e\n\u003ctd\u003etoo small\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5m x 5m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e2 m x 2 m\u003c\/td\u003e\n\u003ctd\u003e4,800\u003c\/td\u003e\n\u003ctd\u003e1.4 m x 1.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5.5m x 5m\u003c\/td\u003e\n\u003ctd\u003e6m x 5m (trim to fit)\u003c\/td\u003e\n\u003ctd\u003e2.5 m x 2 m\u003c\/td\u003e\n\u003ctd\u003e6,000\u003c\/td\u003e\n\u003ctd\u003e1.9 m x 1.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6m x 5m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e3 m x 2 m\u003c\/td\u003e\n\u003ctd\u003e7,200\u003c\/td\u003e\n\u003ctd\u003e2.4 m x 1.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5.5m x 5.5m\u003c\/td\u003e\n\u003ctd\u003e6m x 6m (trim to fit)\u003c\/td\u003e\n\u003ctd\u003e2.5 m x 2.5 m\u003c\/td\u003e\n\u003ctd\u003e7,500\u003c\/td\u003e\n\u003ctd\u003e1.9 m x 1.9 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7m x 5m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e4 m x 2 m\u003c\/td\u003e\n\u003ctd\u003e9,600\u003c\/td\u003e\n\u003ctd\u003e3.4 m x 1.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6m x 6m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e3 m x 3 m\u003c\/td\u003e\n\u003ctd\u003e10,800\u003c\/td\u003e\n\u003ctd\u003e2.4 m x 2.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8m x 5m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e5 m x 2 m\u003c\/td\u003e\n\u003ctd\u003e12,000\u003c\/td\u003e\n\u003ctd\u003e4.4 m x 1.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7m x 6m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e4 m x 3 m\u003c\/td\u003e\n\u003ctd\u003e14,400\u003c\/td\u003e\n\u003ctd\u003e3.4 m x 2.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8m x 6m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e5 m x 3 m\u003c\/td\u003e\n\u003ctd\u003e18,000\u003c\/td\u003e\n\u003ctd\u003e4.4 m x 2.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e9m x 6m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e6 m x 3 m\u003c\/td\u003e\n\u003ctd\u003e21,600\u003c\/td\u003e\n\u003ctd\u003e5.4 m x 2.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10m x 6m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e7 m x 3 m\u003c\/td\u003e\n\u003ctd\u003e25,200\u003c\/td\u003e\n\u003ctd\u003e6.4 m x 2.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10m x 7m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e7 m x 4 m\u003c\/td\u003e\n\u003ctd\u003e33,600\u003c\/td\u003e\n\u003ctd\u003e6.4 m x 3.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10m x 8m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e7 m x 5 m\u003c\/td\u003e\n\u003ctd\u003e42,000\u003c\/td\u003e\n\u003ctd\u003e6.4 m x 4.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e12m x 8m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e9 m x 5 m\u003c\/td\u003e\n\u003ctd\u003e54,000\u003c\/td\u003e\n\u003ctd\u003e8.4 m x 4.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10m x 10m\u003c\/td\u003e\n\u003ctd\u003esame size\u003c\/td\u003e\n\u003ctd\u003e7 m x 7 m\u003c\/td\u003e\n\u003ctd\u003e58,800\u003c\/td\u003e\n\u003ctd\u003e6.4 m x 6.4 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eNot sure? Use the \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003epond liner size calculator\u003c\/a\u003e, which also suggests the pump and filter for your pond.\u003c\/p\u003e\n\u003ch3\u003eInstallation, use and care\u003c\/h3\u003e\n\u003cp\u003eDig the pond, remove every stone and root, and firm the base with 50mm of soft sand. Lay the underlay first, overlapping any joins by at least 300mm, and double it on stony ground or under rockwork. On a warm day, unroll the liner in the sun for 45 to 60 minutes so it relaxes, then lower it in and fold neat pleats at the corners. Fill slowly, easing out creases as the water rises, and only trim the edge once the pond is full. Bed the overlap under the coping.\u003c\/p\u003e\n\u003ch3\u003eKoi Pond Professional Kit: Questions Answered\u003c\/h3\u003e\n\u003ch4\u003eWhat size Koi Pond Professional Kit do I need for a 4m x 3m pond?\u003c\/h4\u003e\n\u003cp\u003eFor a 4m x 3m koi pond that is 1.2m deep you need at least 7m x 6m, so choose the 7m x 6m kit. Work it out as pond length (or width) + (2 x maximum depth) + 0.6m, then round up to the next size. Sizes work either way round.\u003c\/p\u003e\n\u003ch4\u003eIs the underlay included, and what is it?\u003c\/h4\u003e\n\u003cp\u003eYes. Every kit includes 200gsm needle-punched geotextile underlay in the same size as the liner. On the 5.5m sizes the underlay sheet is half a metre larger, so trim the spare off on site.\u003c\/p\u003e\n\u003ch4\u003eWhy choose 1.0mm EPDM instead of 0.75mm for a koi pond?\u003c\/h4\u003e\n\u003cp\u003eKoi ponds are deep, heavy and often surrounded by rockwork, so the liner works harder. The 1.0mm sheet is a third thicker than 0.75mm, which gives more resistance to stones, roots and foot traffic during the build. It is heavier to handle, so plan for two or three people on larger sizes.\u003c\/p\u003e\n\u003ch4\u003eHow deep should a koi pond be?\u003c\/h4\u003e\n\u003cp\u003eA depth of at least 1.2m is widely recommended for koi, with 1.5m giving more stable winter temperatures and more room for growing fish. Use the size table above to check which kit covers your planned footprint at your chosen depth.\u003c\/p\u003e\n\u003ch4\u003eCan the EPDM liner be repaired or extended later?\u003c\/h4\u003e\n\u003cp\u003eYes. EPDM can be patched with EPDM repair sheet and cold-bond adhesive tape, in the same way as butyl. Keep your offcuts after installation, as they make ideal repair patches.\u003c\/p\u003e\n\u003ch3\u003eOrdering and delivery\u003c\/h3\u003e\n\u003cp\u003eChoose your size above and add to basket. The liner and underlay are cut to size for each order, so they cannot be returned once cut; check your measurements against the size table before ordering. Free UK delivery applies to every size. For sizes not listed, or help with a koi pond design, contact our team.\u003c\/p\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Koi and goldfish safe, inert EPDM material\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — All mainland UK sizes delivered free\u003c\/li\u003e\n\u003cli\u003e✅ Lifetime Guarantee — Professional-grade lifetime liner warranty\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Pond contractor and koi specialists on hand\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHelpful Guides\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-koi-wildlife\"\u003eKoi and wildlife pond liners\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-sizing\"\u003ePond liner sizing: measure and order the right size\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-installation\"\u003ePond liner installation: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-materials\"\u003ePond liner materials compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/epdm-pond-liner-1mm-heavy-duty-fish-safe-lifetime-guarantee\"\u003eEPDM 1.0mm pond liner on its own\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/pond-liner-underlay\"\u003ePond liner underlay\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/epdm-pond-liners\"\u003eEPDM pond liners\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"PondLiners Co","offers":[{"title":"5m x 4m","offer_id":57665829405020,"sku":"PLC-KIT-KOI-EPDM10-5X4","price":643.9,"currency_code":"GBP","in_stock":true},{"title":"5.5m x 4m","offer_id":59348837335388,"sku":"PLC-KIT-KOI-EPDM10-5P5X4","price":715.9,"currency_code":"GBP","in_stock":true},{"title":"5m x 5m","offer_id":59348837368156,"sku":"PLC-KIT-KOI-EPDM10-5X5","price":797.9,"currency_code":"GBP","in_stock":true},{"title":"5.5m x 5m","offer_id":59348837400924,"sku":"PLC-KIT-KOI-EPDM10-5P5X5","price":886.9,"currency_code":"GBP","in_stock":true},{"title":"6m x 5m","offer_id":57665829437788,"sku":"PLC-KIT-KOI-EPDM10-6X5","price":949.9,"currency_code":"GBP","in_stock":true},{"title":"5.5m x 5.5m","offer_id":59348837433692,"sku":"PLC-KIT-KOI-EPDM10-5P5X5P5","price":990.9,"currency_code":"GBP","in_stock":true},{"title":"7m x 5m","offer_id":59348837466460,"sku":"PLC-KIT-KOI-EPDM10-7X5","price":1102.9,"currency_code":"GBP","in_stock":true},{"title":"6m x 6m","offer_id":59348837499228,"sku":"PLC-KIT-KOI-EPDM10-6X6","price":1132.9,"currency_code":"GBP","in_stock":true},{"title":"8m x 5m","offer_id":59348837531996,"sku":"PLC-KIT-KOI-EPDM10-8X5","price":1255.9,"currency_code":"GBP","in_stock":true},{"title":"7m x 6m","offer_id":57665829470556,"sku":"PLC-KIT-KOI-EPDM10-7X6","price":1316.9,"currency_code":"GBP","in_stock":true},{"title":"8m x 6m","offer_id":57665829503324,"sku":"PLC-KIT-KOI-EPDM10-8X6","price":1499.9,"currency_code":"GBP","in_stock":true},{"title":"9m x 6m","offer_id":59348837564764,"sku":"PLC-KIT-KOI-EPDM10-9X6","price":1683.9,"currency_code":"GBP","in_stock":true},{"title":"10m x 6m","offer_id":59348837597532,"sku":"PLC-KIT-KOI-EPDM10-10X6","price":1867.9,"currency_code":"GBP","in_stock":true},{"title":"10m x 7m","offer_id":59348837630300,"sku":"PLC-KIT-KOI-EPDM10-10X7","price":2173.9,"currency_code":"GBP","in_stock":true},{"title":"10m x 8m","offer_id":57665829536092,"sku":"PLC-KIT-KOI-EPDM10-10X8","price":2479.9,"currency_code":"GBP","in_stock":true},{"title":"12m x 8m","offer_id":59348837663068,"sku":"PLC-KIT-KOI-EPDM10-12X8","price":2968.9,"currency_code":"GBP","in_stock":true},{"title":"10m x 10m","offer_id":59348837695836,"sku":"PLC-KIT-KOI-EPDM10-10X10","price":3091.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/contractors-installing-1mm-epdm-liner-and-underlay-koi-pond-build.jpg?v=1791071021"},{"product_id":"budget-pond-liner-kit-uk-ldpe-liner-underlay-best-value-complete-kit","title":"Budget Pond Liner Kit UK | LDPE Liner + Underlay | Best Value Complete Kit","description":"\u003ch2\u003eBudget Pond Liner Kit UK — LDPE Liner + Underlay | Best Value Complete Kit\u003c\/h2\u003e\n\u003cp\u003eOur Budget Pond Liner Kit pairs an LDPE pond liner with a matching underlay, so the liner and its protective cushion layer arrive together at the best value. Professional pond builders consider underlay non-negotiable: a pond liner without underlay is a pond liner waiting to fail.\u003c\/p\u003e\n\u003cdiv class=\"plx-keyfacts\" style=\"border:1px solid #d7e3d7;border-left:4px solid #2d6a2d;border-radius:6px;padding:16px 20px;margin:20px 0;background:#f6faf6;\"\u003e\n\u003ch3 style=\"margin-top:0;\"\u003eBudget Pond Liner Kit (LDPE): Key Facts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiner:\u003c\/strong\u003e LDPE pond liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnderlay:\u003c\/strong\u003e geotextile underlay, supplied with the liner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 5 sizes, from 3m x 3m to 6m x 6m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest for:\u003c\/strong\u003e Garden ponds on a budget, as a complete liner and underlay kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by:\u003c\/strong\u003e PondLinersco.co.uk (Express Matting Services Ltd, Burnley, Lancashire, UK)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eOur geotextile underlay is a heavy-duty 200gsm needle-punched polypropylene fabric — the same professional specification used in commercial reservoir lining, landscape drainage, and civil engineering projects. It acts as a cushion between the ground and your pond liner, absorbing the shock of stones, roots, and ground movement that would otherwise puncture or stress your investment over time.\u003c\/p\u003e\n\u003ch3\u003eFull Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eLDPE liner with geotextile underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e200gsm (grams per square metre)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003eLDPE liner; underlay approximately 2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-30°C to +70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Resistance\u003c\/td\u003e\n\u003ctd\u003eGood (protected by liner once installed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish Safe\u003c\/td\u003e\n\u003ctd\u003e✅ Yes — inert polypropylene, non-toxic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003e20 years on the geotextile underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eLDPE liner and underlay supplied as a matched set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Permeability\u003c\/td\u003e\n\u003ctd\u003eHigh — allows drainage, does not trap water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eGrey underlay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5 Reasons Underlay Is Essential\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eStone Puncture Protection\u003c\/strong\u003e — Even carefully prepared ground contains sharp stones that can work upward through soil movement. Underlay provides a tough buffer preventing these from reaching your liner\u003c\/li\u003e\n\u003cli\u003e🌱 \u003cstrong\u003eRoot Penetration Barrier\u003c\/strong\u003e — Aquatic plant roots can penetrate most liner materials over time. 200gsm geotextile significantly reduces this risk\u003c\/li\u003e\n\u003cli\u003e🌡️ \u003cstrong\u003eThermal Insulation\u003c\/strong\u003e — Provides a layer of insulation beneath the liner, helping maintain more stable water temperatures in winter\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eGround Movement Cushioning\u003c\/strong\u003e — Soils expand and contract with moisture changes and frost. Underlay absorbs this movement, preventing it from stressing the liner\u003c\/li\u003e\n\u003cli\u003e⏰ \u003cstrong\u003eExtended Liner Life\u003c\/strong\u003e — Pond liners installed with geotextile underlay last significantly longer than those without. The underlay investment pays for itself many times over\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-Step Installation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcavate and clean\u003c\/strong\u003e — Dig your pond and remove all large stones, roots, glass, and sharp debris. The cleaner the substrate, the better\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoll out the underlay\u003c\/strong\u003e — Starting from one end, roll the underlay fabric into the excavation and press flat against all surfaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap at edges\u003c\/strong\u003e — Allow 30–40cm of underlay to extend beyond the pond edge in all directions, protecting the liner at its most vulnerable point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap joins\u003c\/strong\u003e — If multiple pieces are needed, overlap by at least 300mm. No adhesive needed — the liner weight holds all pieces in position\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall liner on top\u003c\/strong\u003e — The LDPE liner in this kit is installed directly on top of the underlay. The two layers work together to provide optimal protection\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eCompatible With All Pond Liner Types\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ EPDM Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ Butyl Rubber Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ PVC Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ HDPE Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ LDPE Pond Liner — all grades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Inert polypropylene, safe for all aquatic life\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — All mainland UK orders delivered free\u003c\/li\u003e\n\u003cli\u003e✅ 20 Year Guarantee on the underlay — Long-term fabric warranty\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Our team can help calculate the exact quantity needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I really need underlay, or can I use sand instead?\u003c\/strong\u003e\u003cbr\u003eA: Sand is a good supplement but not a replacement for geotextile underlay. Sand can be washed away by water movement during pond filling, leaving voids that create pressure points. Use both sand (50mm base layer) AND geotextile underlay for the best protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How much underlay do I need?\u003c\/strong\u003e\u003cbr\u003eA: Order the same dimensions as your pond liner. The underlay in this kit is supplied in the same size as the liner, so no extra is needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can underlay be used for other applications?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Our 200gsm geotextile is widely used for weed suppression in garden borders, drainage separation layers in decking and paving projects, and erosion control on slopes.\u003c\/p\u003e\n\u003ch3\u003eHow Much Liner Do I Need?\u003c\/h3\u003e\n\u003cp\u003eMeasure the longest length, the widest width and the deepest point of the pond, then for each direction:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLiner length = pond length + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eLiner width = pond width + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe extra 0.6m gives a 30cm overlap on every edge for anchoring. Round up to the next available size; sizes work either way round.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExample:\u003c\/strong\u003e a 3m x 2m pond, 0.6m deep, needs at least 4.8m x 3.8m, so choose the \u003cstrong\u003e5m x 4m\u003c\/strong\u003e size.\u003c\/p\u003e\n\u003cp\u003eNot sure? Use the \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003epond liner size calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eBudget Pond Liner Kit (LDPE): Questions Answered\u003c\/h3\u003e\n\u003ch4\u003eWhat size Budget Pond Liner Kit (LDPE) do I need for a 3m x 2m pond?\u003c\/h4\u003e\n\u003cp\u003eFor a 3m x 2m pond that is 0.6m deep you need at least 4.8m x 3.8m, so choose the 5m x 4m size. The formula is pond length (or width) + (2 x maximum depth) + 0.6m.\u003c\/p\u003e\n\u003ch4\u003eIs underlay included?\u003c\/h4\u003e\n\u003cp\u003eYes. Underlay is included in this listing. Lay it over the prepared, stone-free base first, then lay the liner on top.\u003c\/p\u003e\n\u003ch4\u003eHow many sizes are available?\u003c\/h4\u003e\n\u003cp\u003eThere are 5 sizes, from 3m x 3m to 6m x 6m.\u003c\/p\u003e\n\u003ch3\u003eHelpful Guides\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-choosing\"\u003eHow to choose a pond liner: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-sizing\"\u003ePond liner sizing: measure and order the right size\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-installation\"\u003ePond liner installation: all guides\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pond-liner-guides-materials\"\u003ePond liner materials compared\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/ldpe-pond-liners\"\u003eLDPE pond liners\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"PondLiners Co","offers":[{"title":"3x3m","offer_id":57665829568860,"sku":"PLC-KIT-BUDGET-LDPE-3X3","price":46.9,"currency_code":"GBP","in_stock":true},{"title":"4x3m","offer_id":57665829601628,"sku":"PLC-KIT-BUDGET-LDPE-4X3","price":62.53,"currency_code":"GBP","in_stock":true},{"title":"5x4m","offer_id":57665829634396,"sku":"PLC-KIT-BUDGET-LDPE-5X4","price":104.22,"currency_code":"GBP","in_stock":true},{"title":"6x5m","offer_id":57665829667164,"sku":"PLC-KIT-BUDGET-LDPE-6X5","price":156.33,"currency_code":"GBP","in_stock":true},{"title":"6x6m","offer_id":57665829699932,"sku":"PLC-KIT-BUDGET-LDPE-6X6","price":187.6,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/pond-liner-kit-contractors-liner-over-underlay.jpg?v=1791111840"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/collections\/epdm-pond-liner-and-underlay-bundle-contractors-installing.jpg?v=1791115321","url":"https:\/\/www.pondlinersco.co.uk\/collections\/pond-liner-kits.oembed","provider":"PondLinersco.co.uk","version":"1.0","type":"link"}