Pondmaster® Pond-Mag® Pumps are designed to work as pond pumps, fountain pumps, and waterfall pumps. They have been fulfilling the needs of professionals and hobbyists for over 20 years with efficient, quiet and reliable 24/7 performance. Pond-Mag® Pumps are ideal in either saltwater (up to model 18) or freshwater environments and operate equally well when used as in-line pumps or submersible pumps. With only one moving part (a ceramic impeller) and an epoxy-encased power unit, you don't have to worry about contaminating the water with harmful oils or chemicals! Includes rigid pre-filter.