The Aqueon QuietFlow Aquarium Canister Filters are for aquariums from 40 to 155 gallons. Aqueon QuietFlow Canister Filters are designed for both freshwater and saltwater aquariums. The QuietFlow canister is pre-loaded with biological, chemical and mechanical media. Included is a unique hang on the back Water Polishing Unit that makes maintenance quick and easy. Instead of disassembling the canister housing to replace the contents of the media basket, simply replace the carbon cartridge in the Water Polishing Unit. This cuts down on maintenance time and means less frequent changes to the media baskets. For water return you can choose between the included Water Polishing Unit, spray bar and the water director.

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