Little Giant Pond And Pump Filter Mechanical filters clean water before entering the pump, ensuring your pump runs more efficiently and effectively, with less maintenance. Helps keep debris from entering pump and fountain nozzle or biological filter. Two easy to clean filter pads, one coarse and one fine. 8" stem with adapter for use with fountain heads. Converts to biological filter by adding Biological Media 566112. Compatible pumps: 566718, 566608, 566611. Compatible fountain nozzles: 566267, 566240, 566518. 3 year warranty.