The Penn Plax 400 Cascade Internal Aquarium Filter is designed to provide better filtration and aeration above and below the surface. Fully submersible, this aquarium filter provides physical, chemical and biological filtration for fish tanks from 10 to 20 gallons in size. The activated carbon cartridge removes harmful chemicals, toxins, odors, and other contaminants from your aquarium’s water. Also included is an internal sponge that optimizes colonization of beneficial anaerobic bacteria. The large capacity internal filter cup allows you to choose your own filter medium according to your needs. This aquarium filter has an adjustable and directional water flow output, pumps up to 110 gallons per hour, and a spray bar option that will distribute water evenly to aid aeration. The round directional flow spout has a connector where you can connect to your flexible tubing to drive water fountains or other accessories. The Cascade 400 Fish Tank Filter mounts quickly using the included suction cups and can be placed horizontally in order to remove from view. Great for aquariums and terrariums, these filters give you crystal clear water in your fresh or saltwater environments. The Cascade 400 Aquarium Filter measures 8 inches in length by 2 inches in width and 5 inches deep and runs on a 110V electrical current and is UL approved.