TOM TM1268 Aquarium Rapids Power Filter PF-80, 80gph flow rate can be used for either fresh or salt water aquariums, effectively purifies the aquarium"s water while extracting unwanted fish waste and particles. These filters increase beneficial gas exchange as the water is return to the aquarium. The Rapids Power Filter is easy to operate and hangs on the back of the aquarium. Made of high impact p lastic for yea rs of dependable service. KollerCraft is highly regarded for supplying superior quality, innovative pet products and reliable service.