Oase Biosmart Gravity Filter

Multi-stage mechanical and biological filtration system in acompact 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 requireremoval of the filter foams during maintenance.. .