BTSM ecological filtration system - designed for small koi pond recommendation applies to a capacity of 30-140 cubic meters of water ideal for pond koi pond filter automatically transferred via mechanical sieve preliminary filter to significantly extend the life with???? There are separate collection tank cleaners used to remove contaminants crude preliminary filter? a variety of media filtration units and large settlement surface contains microbes provide maximum contact area? influent flow rate can be adjusted individually? separate filter cleaning sewage system? Optional UV purifier? convenient and easy filter sponge cleaning operation? can be connected to the water skimmers use