The Emperor Aquatics Smart UV Sterilizer is watertight and safe to use with all types of ponds and aquariums. Each sterilizer is constructed of thick, UV resistant plastic that increases durability and longevity. All models feature quartz sleeves and lamps rated for 9,000 hours.For aquarium or pond use-For aquariums up to 300 gallons. The 300 gallons rating assumes the unit is being used as a clarifier (algae) and sterilizer.-For ponds up to 4,725 gallons40 watt T5 UV lampIn lineConnections: 1.5" union inlet/ 1.5" union outletA pump is a required. The required flow rates:-Algae: 1574 gph maximum, 943 gph minimum-Protozoa: 525 gph maximum, 314 gph minimumDimensions: 43.8" X 3"Accessories:Emperor Aquatics 3" Mounting Bracket