The Eheim Ecco external canister filter is self priming, has a compact design and is easy to use it also comes complete with accessories and media to get you started.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. Good for aquariums up to 60 U.S. gallons. Media included: 2 liter Ehfisubstat, 1 carbon pad, 1 fine filter pad, 1 coarse blue pad, 3 media trays. The manufacturer recommends this filter for both freshwater and saltwater applications.