Biocell Filter Media For Ponds & Koi Fish

Getting the amount right makes all the difference to water clarity and fish health, so it's worth matching the volume of biocell media to your filter chamber and overall pond size rather than just topping up loosely — too little and beneficial bacteria won't establish enough to cope with waste, especially with koi, which are heavy feeders. If you're unsure how much biological media your setup needs, our Pond Filter Size Recommender can help you work out the right capacity before you order. Because the media simply sits and tumbles within your existing filter, topping up or refreshing it is a quick job with no need to overhaul your whole system, and a well-stocked chamber means fewer green water problems and healthier, clearer water all season long.