Eheim Professional II Canister Filter model 2028 rated to 158 U.S. Gallons, with no filter media. 277 GPH pump output. 1.9 U.S. Gallon filter volume. Pump uses 25 watts. Integrated priming aid, 'Push II Prime', for a quick and easy start up. Hose adapter with automatic opening and closing of the built-in shut off taps. Combination lever with safety catch to release adapter. Ball display maintenance indicator to signal blockages in the filter circulation. Adjustable water flow rate. New and improved access impeller cover. Safe for fresh or salt water. 3 year guarantee.