The Pond Boss̠ 225 GPH Pond Pump is built using only the highest quality neodymium magnets, as their main component. These magnets are the strongest and longest lasting magnets on the planet! These powerful magnets allow all of our pumps to run without oil or other unwanted liquids. This pump is very energy efficient, easy to install and easy to maintain. It is our most popular choice for small ponds. This pump is designed for fresh water use only. 1 year warranty. UL listed.