MarineLand Emperor Filter Systems, 400B WITH ROTATING BIO-WHEEL: Patented Bio-Wheel technology provides excellent wet/dry biological filtration MULTI-STAGE FILTRATION: Delivers mechanical, chemical and biological aquarium filtration to maintain a clean aquatic environment. POWERFUL: Certified flow rate of 400 GPH in aquariums up to 80 gallons. MARINELAND FILTRATION PRODUCTS: Count on Marineland brand for the most reliable, technically advanced aquariums and accessories on the market. REPLACEMENT CARTRIDGES: Use with two Marineland Rite-Size E Filter Cartridges (purple label).