3-stage filter mechanical and biological filtration; 'Optional equipment with Jebao CW-36 pond clarifier to ensure the best performance. (CW-36 pond clarifier sold separately)
While it does require a pump to operate, ideally this type of filter is positioned above the water surface, at the edge of the pond or above a waterfall. From that position, the water flows through the filter and back into the pond via gravity.
