The Seapora In-Tank / Submersible Ultraviolet Sterilizer eliminates harmful free floating microorganisms, pathogens, and algae, cleaning and clearing up aquarium water. It features a built-in light amplifying reflector for increased output and performance. A long-lasting high-performance lamp (typically lasting up to 9000 hours) and optimized circulation pump are included. The epoxy-sealed lamp assembly protects against moisture and allows direct, unfiltered contact with the sterilizing ultraviolet tube. The Seapora Ultraviolet Sterilizer is also a powerful clarifier with a small footprint & compact design, and can be mounted either vertically or horizontally on your aquarium. For a simple, unique and effective way to sterilize and clarify aquarium water in either freshwater or saltwater aquariums, give the Seapora Ultraviolet Sterilizer a try!