The Aqua Ultraviolet Classic 8 Watt White 3/4" UV Sterilizer is the premium choice for the water sterilization for aquariums up to 50 gallons.A pump is a required. The required flow rates is approx. 100 gph.Dimensions: 16" X 6" X 2-1/2"Inlet: 3/4" barb or FPT, Outlet: 3/4" barb or FPTWhiteHousing: Limited lifetime warranty on housing against Ultraviolet degradation. Complete Unit: One year from date of purchase or 18 months from manufacturing dateControls algae, bacteria & protozoaClears water in 3-5 days, sometimes overnight Instructional Manual (pdf format in new window)