Fluval Clearmax Phosphate Remove Filter MediaFluval ClearMax is a science grade resin designed to adsorb phosphate, nitrite and nitrate. Getting rid of these compounds produces crystal clear water, reduces odours, and creates ideal conditions for fish. It also helps reduce time spent on maintaining your aquarium. Removes & Controls Phosphate, Nitrite and Nitrate Creates & Maintains Crystal Clear Water Reduces Maintenance For Fresh and Salt water Treats 80 Gallons