Aqua-Tech Ultra Quiet Power Filter is your answer to keeping aquarium water pristine without the fuss. Our complete 3-stage filtration system provides coarse floss to remove large particles from aquarium water; carbon filtration to remove odors, discoloration and impurities; and Bio-Foam biological filtration to remove toxic ammonia and nitrites on contact. To ensure crystal-clear aquarium water, change the filter cartridge once a month, as carbon deactivates with use.Even with a decoupled motor running at less than 40 dB, this filter makes no sacrifices when it comes to power. Our impeller and motor assembly designed for efficient power usage filters a whopping 200 gallons per hour – completely filtering 20- to 40-gallon aquariums 5 times per hour. This filter uses the Aqua-Tech EZ Change #3 Filter Cartridge with Premium Activated Carbon. Aqua-Tech Filter Cartridges trap dirt, remove impurities and deliver maximum water-to-carbon contact to make your aquarium water sparkle. Designed to fit standard aquarium hoods and canopies, the Aqua-Tech Ultra Quiet Power Filter is a sophisticated filtering process made easy. Whatever your individual needs, Aqua-Tech products help make aquarium maintenance simple for a clean and beautiful aquatic environment.