{"product_id":"cold-water-pond-bacteria-uk-works-below-10-c-winter-pond-treatment-clears-green-water","title":"Cold Water Pond Bacteria UK | Works Below 10°C | Winter Pond Treatment | Clears Green Water","description":"\u003cp\u003e\u003cstrong\u003eCold water pond bacteria is a specially formulated beneficial bacteria treatment that continues working when pond temperatures fall below 10°C — even down to 4°C. It keeps your pond filter biologically active through winter, preventing the toxic ammonia spikes that standard summer bacteria treatments cannot handle in cold UK conditions.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eWhy Standard Pond Bacteria Fail in Winter\u003c\/h2\u003e\n\u003cp\u003eMost pond bacteria products on the market contain mesophilic bacteria strains — organisms that thrive between 15°C and 35°C. When water temperatures drop below 10°C (which happens throughout the UK from October to March), these bacteria become dormant or die off, leaving your pond's nitrogen cycle without biological support. The result is rising ammonia and nitrite levels, which stress or kill fish.\u003c\/p\u003e\n\n\u003ch3\u003eCold Water Bacteria: Engineered for British Winters\u003c\/h3\u003e\n\u003cp\u003eOur cold water pond bacteria formula contains a blend of \u003cstrong\u003epsychrotrophic bacterial strains\u003c\/strong\u003e — organisms naturally adapted to function at low temperatures. These continue breaking down ammonia, fish waste, and organic debris even when your pond thermometer reads just 4°C, keeping your fish safe and your filter alive through the coldest months.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eWorks below 10°C\u003c\/strong\u003e — active as low as 4°C\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003ePrevents winter ammonia spikes\u003c\/strong\u003e — biological filter stays active\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eClears green water\u003c\/strong\u003e — even in cold conditions\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eKoi \u0026amp; goldfish safe\u003c\/strong\u003e — completely natural treatment\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eNo chemicals\u003c\/strong\u003e — beneficial bacteria only\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eUK tested\u003c\/strong\u003e — formulated for British winter conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eActive temperature range\u003c\/td\u003e\n\u003ctd\u003e4°C – 30°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBacteria type\u003c\/td\u003e\n\u003ctd\u003ePsychrotrophic beneficial strains\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003ePour directly into pond or filter\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTreatment frequency\u003c\/td\u003e\n\u003ctd\u003eMonthly October–March\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSafe for\u003c\/td\u003e\n\u003ctd\u003eAll pond fish, plants, wildlife\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eAvailable sizes\u003c\/td\u003e\n\u003ctd\u003e250g, 500g, 1kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eHow to Apply\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eShake product well before use.\u003c\/li\u003e\n  \u003cli\u003eApply directly to your pond near the filter outlet or return flow for even distribution.\u003c\/li\u003e\n  \u003cli\u003eTreat monthly throughout autumn and winter (October–March).\u003c\/li\u003e\n  \u003cli\u003eFor new ponds or after water changes, apply a double dose.\u003c\/li\u003e\n  \u003cli\u003eStore in a cool, dark location away from direct sunlight.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eHow is this different from regular pond bacteria?\u003c\/h3\u003e\n\u003cp\u003eStandard pond bacteria products use mesophilic strains that become dormant below 10°C. This product uses cold-adapted psychrotrophic strains that remain fully active throughout British winters, maintaining your nitrogen cycle when standard products fail.\u003c\/p\u003e\n\n\u003ch3\u003eShould I keep my filter running in winter?\u003c\/h3\u003e\n\u003cp\u003eYes — for koi ponds especially. Keep your filter running year-round (you may reduce flow slightly in very cold weather). This product will keep your filter biologically active even in freezing temperatures.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use this alongside other pond treatments?\u003c\/h3\u003e\n\u003cp\u003eYes. Cold water pond bacteria is compatible with most pond treatments. However, avoid dosing immediately after using algaecides or other antibacterial treatments as these may affect live bacteria.\u003c\/p\u003e\n\n\u003ch3\u003eHow much do I need for my pond size?\u003c\/h3\u003e\n\u003cp\u003eThe 250g size treats ponds up to approximately 5,000 litres. The 500g suits ponds up to 10,000 litres. The 1kg pack is ideal for large koi ponds of 15,000–25,000 litres with heavy fish loading.\u003c\/p\u003e\n\n\u003ch3\u003eWhen should I start using cold water bacteria?\u003c\/h3\u003e\n\u003cp\u003eBegin your first dose when pond temperatures consistently drop below 12–14°C — typically September or October across the UK. Don't wait for the temperature to crash before starting treatment.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e🚚 Free UK delivery | 📦 Dispatched within 1 business day | 💬 Expert pond advice available\u003c\/em\u003e\u003c\/p\u003e","brand":"PondLiners Co","offers":[{"title":"250g","offer_id":57667226927452,"sku":null,"price":66.0,"currency_code":"GBP","in_stock":true},{"title":"500g","offer_id":57667226960220,"sku":null,"price":109.97,"currency_code":"GBP","in_stock":true},{"title":"1kg","offer_id":57667226992988,"sku":null,"price":179.97,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/d9eeb2e9d16651d439a3f0c0e0becfe9.jpg?v=1779042945","url":"https:\/\/www.pondlinersco.co.uk\/products\/cold-water-pond-bacteria-uk-works-below-10-c-winter-pond-treatment-clears-green-water","provider":"PondLinersco.co.uk","version":"1.0","type":"link"}