For ponds up to 6000 gallons. The 6000 gallons rating assumes the unit is being used as a clarifier (algae) only and not as a sterilizer.40 watt T5 UV lampIn lineConnections: 2" slip connectionRequires an approx. 2,800 gph pumpDimensions: 36" X 4" X 2.75"Ballast separate from unitUse the 3/4" Bushing-Hose Barb Kit for use with 3/4" hose