Eheim Professional Wet-Dry Canister Filter model 2229 rated for 158 U.S. Gallons with no filter media. 277 GPH pump output. 1.9 U.S. Gallon filter volume. Pump uses 25 watts. Comes with EZ clip system which consists of four sturdy clips, which together with the built-in gasket and recessed lid handles, make the pump head of these filters easy to remove. Comes with Eheim's new filter media containers. Fitting directly into the pump head, the newly developed integrated Eheim double tap connector ingeniously combines the shut-off valves, the hose connections, and the locking clamp into a single unit. Wet/Dry versions fill and empty in a continuous cycle providing unmatched aerobic breakdown of toxins. Ideal where maximum bio filtration is needed. Approx. surface area = 30,000 square