Marineland Emperor PRO Power Filter delivers 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. Uses Marineland Rite-Size™ E Filter Cartridge. Filters your 90-gallon aquarium five times per hour with flow control up to 450 GPH.