The AQUATOP UVP-9 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 UVP-9 requires no special plumbing and is easy to use and maintain. Simply place the UVP-9 directly into your tank or sump system up to the waterline. The built in pump will draw water in, running it past the 9 watt UV bulb. The UV light will sterilize and clarify, producing crystal clear water.