PondMaster® Submersible Ultraviolet ClarifiersControls Water Born Algae and Prevents Spread of Diseases Can be used in or out of the water Fully submersible unit's vortex flow design exposes water longer to ultraviolet light Glowing monitor Halo Ring visible from any angle shows it's working Comes complete with 9000 hour, long life lamp and water tight quartz sleeve Includes transformer and 18' grounded power cord Black color is unobtrusive whether used in or out of the water 1 year warranty