Submersible 40-watt ultraviolet pond light for killing algae and bacteria * Clarifies and sterilizes ponds up to 6,000 gallons; for use with pumps up to 3,000-gph * ¾-inch, barbed intake and outlet for attaching flexible tubing; 18-foot power cord * Vortex flow design and slim diameter increases exposure to intense UV rays * Measures 23-1/2 by 4 inches (length by width); submersed or above surface installation