The Eheim Ecco external canister filter is self priming, has a compact design and is easy to use..The Ecco Comfort filter provides 3 types of filtration: biological, chemical, and mechanical. The filter is also equipped with filter media baskets for easy filling and cleaning. Also included are 2 detachable, swivel shut-off taps for simple and safe hose-to-filter connection. With proper media set-up a long service life can be expected, with 3 to 6 months between cleanings. Good for freshwater and saltwater aquariums up to 35 U.S. gallons.