The Aqueon Quietflow 20 Power Filter combines ultra-quiet operation, industry-high flow rate and enhanced filtration to provide the ideal solution for your aquarium. The iin-tank pump design virtually eliminates noise, lowers the overall profile of the unit, and allows the filter to start without priming. Double biological grids, including a unique wet/dry mechanism, provide an huge amount of area to support beneficial bacteria growth for bio filtration. Quietflow has a flow rate of 125 gph for more turnover and greater efficiency than similar filters. Easy to replace filter cartridges make this powerful tank filter easy to maintain. Includes a large sized cartridge to get you started.