Submersible UV sterilizer eliminates harmful free floating micro organisms, pathogens, and algae. Small footprint & compact design. Can be mounted either vertically or horizontally. Long-lasting, high performance ultraviolet lamp (typical 9,000 hrs) and optimized circulation pump included.Built in light amplifying reflector for increased output and performance. Epoxy sealed lamp assembly protects against moisture allow direct, unfiltered contact with UV tube. Optimized circulation pump included. Rated for tanks up to 100 gallons.