FIBREGLASS KOI SAND FILTER 2 BAG. We strongly recommend fibre glass filters owing to their superior strength and durability. DO NOT SKIMP on quality with these filters. Sand filters are used as a first step in the water treatment process of water purification. Fibreglass sand filters are made with woven fibreglass and are superior in construction and designed specifically with Koi keeping in mind. The easy access lid is located at the top of the filter for ease of use and for open backwashing. Pressure testing done on fibreglass sand filters have shown to have passed the standard 4000 cycle test and exceeded 26 750 cycles.
How a Koi Pond Sand Filter Works
Sand filters force water upward through a bed of sand. This causing “liquification,” whereby the sand takes on liquid properties. When the sand particles get suspended just right, their functional surface area increases, encouraging the growth of bacteria that break down ammonia — a nitrogen compound that koi produce as biological waste — into less-toxic compounds. Most commercial sand filters include screens to filter out large debris, providing mechanical filtration as a by-product.