Join the millions of other demanding aquarists that have chosen Penguin power filters with complete, 3-stage filtration to keep their aquarium clear, clean, and healthy! Check out these fantastic improvements to the already efficient Penguin line. A larger BIO-wheel means more area for nitrifying bacteria to grow, keeping your aquarium totally free of harmful ammonia and nitrites. Increased flow rates maintain optimum water circulation and insure proper BIO-wheel rotation. Adjustable mid-level intake strainer allows you to take water from mid-tank for complete circulation. The all-new cover design and sealed motor dramatically reduces water noise while still maintaining optimum oxygenation. All models still use the handy Rite-Size filtration media cartridges so changing the filter is a snap. For complete, easy filtration of your aquarium, nothing works like a Penguin. Specifications: Good up to a 20 gallon tank. Size: Filter is 5" x 5" x 7.5" high. Warranty: Filter has a 3 year warranty on performance.