The Aquatop SP7-UV submersible UV pump is a new and innovative method for a healthier aquarium environment. Unlike typical UV 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 produce crystal clear water. The SPUV filter uses a submersible top-mounted pump to draw water past its high output and compact UV Bulb. The UV Bulb is encapsulated in a unique quartz sleeve and the SP7UV includes a replaceable filter sponge to mechanically filter organic waste before water passes over the U.V. Bulb. The efficient design of the SP-UV Elite Series filter allows for U.V. to be submersed in both fresh and saltwater aquariums. With its flexibility, the SP-UV Elite Series can be placed anywhere in an aquarium, sump tank, or water garden. The design allows for easy installation and maintenance.