Powerhead Model 70 is a multifunctional pump delivering outstanding performance for various applications. Efficiently drives undergravel filters, circulates and aerates aquarium water. Attaches to AquaClear Quick Filter. It can be connected to protein skimmers, which are essential devices for most marine aquariums. Freshwater aquariums benefit from additional currents in many applications. Using a Powerhead 402 in combination with an AquaClear Quick Filter provides added safe mechanical filtration for cleaner water conditions and protects baby fish. A unique reverse flow feature allows the Powerhead to force water down the undergravel riser stem and beneath the gravel. This helps promote bacterial growth from the bottom up. Injection of oxygen-rich water beneath the undergravel bed supports superior conditions for beneficial nitrifying bacteria. Powerhead Model 70 includes the following design, safety and utility innovations: a compact, energy- efficient, and completely submersible motor, insulated in epoxy resin to protect against harsh fresh and salt water environments, a venturi aeration feature which increases surface agitation and gas exchange, a convenient rim attachment bracket that fits easily on most standard aquarium rims, flow control. Maximum flow rate is 400 US gph/1514 lph. Recommended aquarium capacity is 75 US gal/284 L. 20 Watts.