This set can service goldfish ponds up to 13500 litres 3000 gallons or koi ponds up to 9000 litres 2000 gallons.This Filter is new for 2013 and boasts the best easy clean system we have ever seen. The usual foam 'rings' have been replaced by cubes during cleaning these cubes are broken up by the internal paddle which disturbs the debris.The pond pump is also new for 2013 and despite offering a max output of 6500 lph is only 50 watts to run.