The Marineland Penguin Pro Power Filters deliver easy, three-stage mechanical, chemical and biological aquarium filtration. This ultra-quiet filter has a decoupled motor to reduce noise so you can relax and enjoy your aquarium. This power filter contains BIO-Wheel technology to provide wet/dry biological filtration for nitrifying bacteria growth and eliminating toxic ammonia and nitrate fast. For aquariums from 10 to 75 gallons. Four versions to choose from: Penguin Pro Filter 125, Penguin Pro Filter 175, Penguin Pro Filter 275, & Pengion Pro Filter 375. Useful Links: Penguin Bio-Wheel Power Filters User Manual. Related Products : Penguin Bio-Wheel Aquarium Filter Parts I Penguin Bio-Wheel Aquarium Filter Media.