For tamks up to 20 gallons Flow rate is 65 gallons a hour No other waterfall filter combines the silent operation, massive flow rates and ease of use for both fresh and saltwater aquariums.With rock-solid construction throughout, the heart and soul of the system is the stainless steel impeller shaft with Teflon bushings and powerful, hi-tech magnets ??? all embedded in the motor housing where the shaft won't warp, rust or crack, ever. This is the secret to its dead silent, reliable, continuous operation for both mechanical and bio filtration. Combine this with our state-of-the-art filtering using our bio-engineered, research-grade cartridges that are included, and you have the perfect system for a healthy environment for years to come. Features: The waterfall style output from the filter agitates the surface while creating beneficial currents throughout the entire volume of the aquarium. Both the surface agitation and water current bring more water molecules to the surface in physical contact with the atmosphere, enabling them to release carbon dioxide and replenish oxygen more efficiently. The aquarium power filters are designed to fully exploit the benefits of removing aquarium waste, both mechanically and biologically, to produce debris free and clear water. Benefits: Excellent bio-filtering High flo-rates High quality construction Quiet operation Strong impeller magnets Economical energy usage Filter cartridges available Guaranteed one year from date of purchase Info from Marine Enterprises