Submersible U.V. 10 watt with Halo indicator and 18 foot power cord, barbed 3/4 inch input-output fittings. Clarifier suitable for small ponds up to 1500 gallons using pumps up to 700 gph. Fully submersible unit's vortex flow design exposes water longer to ultraviolet light. Glowing monitor halo ring, visible from any angle immediately shows it's working. Comes complete with 9000 hour, long life 10 watt lamp and water tight quartz sleeve. Includes transformer and 18 ft. grounded power cord. Black color is unobtrusive whether used in or out of the water