Aquatop SP7UV 7W Internal Filter w/ UV SterilizerThe AQUATOP SP7 UV 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 SP7 UV requires no special plumbing and is easy to use and maintain. Simply place the SP7 UV directly into your tank or sump system up to the waterline. The built in pump will draw water in, running it past the 7 watt UV bulb. The