2000lt fish pond (old water tank with a liner), pump is a OZITO sump pump delivering 7000lt an hour and filtered through a swirl type filter at the top and feeding the 1m x 1M x 400mm grow bed containing clay ball media. Flood and drain via a bell syphon every 5mins. Pond is housing 9 silver perch, 2 freshwater Barramundi and half a dozen small Koi. 😁