The AQUATOP SP9-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 SP9-UV requires no special plumbing and is easy to use and maintain. Simply place the SP9-UV 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. How does the SP9UV Work? 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 SP9UV includes two replaceable carbon filter cartridges to mechanically & chemically 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. Sterilization 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. Features: Submersible Filter Built-in Pump Adjustable Flow Rate 9 Watt UV Light Eradicates and Controls Free-floating Micro-organisms and Pathogens Requires No Additional Plumbing Separate Power Cord for Pump and UV System Can be placed in Tank or Sump Includes Replaceable Activated Carbon Filter Cartridge