Danner s magnetic drive pump by PondMaster is a magnetically-driven submersible pump that circulates 1 800 gallons per hour. This unique energy efficient design uses only one moving part - a ceramic/magnetic impeller. This pump series was specifically designed as a circulating pump for freshwater aquariums and ponds. Only one moving part means that there aren t any seals to wear out and it s approved for indoor and outdoor use. The pump is ideal for fountains and ponds fish tanks waterfalls flooded rooms statuary and sump pumps. The pump includes a pre filter and a three pronged 18 foot cord that makes installation a breeze even in large ponds.