AquaTop UV Sterilizing Pump - SP7UV The 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 UV light will sterilize and clarify, producing crystal clear water.