Pond Liner & Underlay Bundle UK | EPDM 0.75mm + 200gsm Geotextile | Complete Kit

EPDM Rubber Pond Liner 0.75mm UK — Fish Safe | Lifetime Guarantee | Free UK Delivery

When it comes to pond liner materials, EPDM rubber is the professional's first choice — and our 0.75mm EPDM Pond Liner 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.

EPDM (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.

Full Technical Specifications

5 Use Cases for EPDM 0.75mm Pond Liner

• 🌿 Wildlife Garden Ponds — Create a thriving habitat for frogs, newts, dragonflies and hedgehogs. EPDM's flexible nature allows for gentle sloping edges that wildlife ponds require
• 🐟 Goldfish & Ornamental Fish Ponds — Fish safe for goldfish, shubunkins and other ornamental fish in ponds under 1.2m deep. For koi ponds, choose our Koi Pond Professional Kit with 1.0mm heavy-duty EPDM instead
• 💧 Stream Courses and Waterfalls — EPDM's flexibility allows it to be formed around complex stream courses, waterfalls, and cascades without creasing
• 🌸 Formal Ornamental Ponds — Clean black finish creates the reflective appearance preferred in formal garden design
• 🌊 Natural-Style Garden Ponds — Available in sizes from 3m x 3m up to 8m x 6m for natural-style garden ponds under 1.2m deep

Step-by-Step Installation Guide

1. Excavate and prepare — 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
2. Install underlay — 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
3. Warm and position the liner — 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
4. Mould to shape — Gently press the liner into the pond contours, creating neat pleats at corners. Work from the centre outward. Do not stretch excessively
5. Fill and secure — 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

Why Choose EPDM Over PVC or HDPE?

• vs PVC: EPDM remains flexible indefinitely. PVC can become brittle after years of UV exposure. EPDM has a proven 40+ year lifespan
• vs HDPE: 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
• vs Butyl: EPDM offers similar performance to Butyl at a more accessible price point — making it the top choice for value-conscious pond builders

✅ Trust & Guarantee

• ✅ Fish Safe Certified — Tested and approved safe for all fish species including koi and goldfish
• ✅ Free UK Delivery — Free delivery to all mainland UK addresses
• ✅ Lifetime Guarantee — Manufacturer's lifetime guarantee on material integrity
• ✅ Expert Advice Available — Call our pond specialists for free sizing and installation advice

Frequently Asked Questions

Q: How do I calculate the liner size I need?
A: 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.

Q: Can EPDM be repaired if it gets a puncture?
A: 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.

Q: Is EPDM safe for plants as well as fish?
A: 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.

How Much Liner Do I Need?

Measure the longest length, the widest width and the deepest point of the pond, then for each direction:

Liner length = pond length + (2 x maximum depth) + 0.6m
Liner width = pond width + (2 x maximum depth) + 0.6m

The extra 0.6m gives a 30cm overlap on every edge for anchoring. Round up to the next available size; sizes work either way round.

Example: a 3m x 2m pond, 0.6m deep, needs at least 4.8m x 3.8m, so choose the 5m x 4m size.

Not sure? Use the pond liner size calculator.

EPDM Pond Liner and Underlay Bundle: Questions Answered

What size EPDM Pond Liner and Underlay Bundle do I need for a 3m x 2m pond?

For 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.

Is underlay included?

Yes. Underlay is included in this listing. Lay it over the prepared, stone-free base first, then lay the liner on top.

How thick is the EPDM Pond Liner and Underlay Bundle?

The liner is 0.75mm thick.

How many sizes are available?

There are 6 sizes, from 3m x 3m to 8m x 6m.

Helpful Guides

• How to choose a pond liner: all guides
• Pond liner sizing: measure and order the right size
• Pond liner installation: all guides
• Pond liner materials compared
• EPDM pond liners