A submersible UV sterilizing pump is a new and innovative method for eradicating and controlling free-floating micro-organisms as well as disease causing pathogens. Unlike typical UV sterilizing systems, the SP-UV Series requires no special plumbing and is easy to use and maintain. Simply place the SP-UV directly into your tank or sump system up to the waterline. The built in pump will draw water in, running it past the UV bulb. The UV light will sterilize and clarify, producing crystal clear water.