Fluval ClearMax Filter Media. Fluval 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. Key Features : Chemical filter media Traps phosphate, nitrite and nitrate Creates crystal clear water and ideal conditions for fish and plants Helps reduce overall aquarium maintenance time Treats up to 300 L (80 US gal) Convenient 3 Pack x 100 g (3.52 oz) format Ideal for use with most canister filters For best results, replace every 4 weeks For use in freshwater and saltwater* aquariums *Clearmax does not remove nitrates from saltwater applications.