Aquatop UVE13 UV Sterilizing Pump, 13-Watt 211--Gallons per hour flow rate Built in 8-watt water pump 13-watt UV light Eradicates and controls free-floating micro-organisms as well as disease causing pathogens Suitable for Saltwater tanks up to 75--Gallons or Freshwater tanks from 200-500--Gallons