Oase Biosmart Gravity Filter

Multi-stage mechanical and biological filtration system in a compact package","Designed for medium ponds or for ponds moderate biological load","Biological filtration stage - water is channeled through a series of foam filters that allow settling of beneficial bacteria","Harmful ammonia and nitrites are converted to nitrates which support plant life in the pond","Features a built-in cleaning mechanism that does not require removal of the filter foams during maintenance.