Designed for tanks 20-40 gal;No water by-pass; Water is forced through the media baskets, thanks to it's flush design;Includes ball-valve connections for simple flow adjustments and easy flow shut off and removal for filter maintenance;No noise or vibration;Filter circulation: 160 GPH; Pump output: 190 GPH; Max head: 4.27 ft. Power consumption: 11W; Filter volume: 3.4 qtr.