Effectively cleans & filters water Patented QuietFlow filtration technology Easy to install using included suction cups Includes carbon cartridge for chemical filtration Specifications: br /> QuietFlow 3: Aquariums up to 3 gallons (2.75"L x 2.75"W x 6.81"H) QuietFlow 10: Aquariums up to 10 gallons (4.69"L x 3.75"W x 6.31"H) QuietFlow 20: Aquariums up to 20 gallons (5.75"L x 3.94"W x 8.19"H) QuietFlow 40: Aquariums up to 40 gallons (6.5"L x 5.69"W x 11.19"H)