The CF400-UV has become a very popular canister filter for the price and performance. The 370GPH, 3+1 filtration system is ideal for fresh and saltwater aquariums ranging in size from 75 gallons to 125 gallons. The integrated 9 watt UV sterilizer helps keep your aquarium healthy and crystal clear. The CF400-UV defies its low price because it comes equipped not only with a UV sterilizer but all the necessary plumbing for installation and includes three large filtration media compartments, allowing you to add the filtration media of your choice.