Our ABF series Pond Filter is designed to purify pond water by removing waste products that are created by Fish and Koi. Our Pond Filter is completely different from Swimming Pool Filter. Biological and Chemical Filter is the place in charge of water treatment. Water Polluted with fish feces and left over food is carried to the filter tank. The Polluted water is purified in it by microorganism called filtering bacteria and then the purified water is sent back to the pond again. This is called “ Circulation Filtration “.The Polluted water is passed through the different chambers of the filter which contains the Filter Mat, Filter Media, Activated Carbon, Chemical Balls and UV Chamber.