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 375 gallons per hour ? completely filtering 30- to 60-gallon aquariums 6 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 a