Why do Koi require more filtration than other fish?
Koi are the largest fish usually kept in ponds and can reach 2 – 3 feet (60 – 90cm) in length. As such they consume more feed and produce more waste than other ornamental fish. To cope with this the filter needs to be around twice as large as for other species. The filter and pump need to be capable of filtering the water in the pond every one or two hours. Another reason is that Koi require much higher quality water than other pond species and this is achieved by using a filtration system that ensures no ammonia or nitrite is present in the water.
