Marina Carbon effectively removes heavy metals, odors, discolorations, organic contaminants and pollutants and leaves your aquarium water crystal clear and sparkling. This high quality and long-lasting pelletized carbon media will not adversely affect water chemistry or raise phosphate levels. This is genuine Marina filter media, designed exclusively for Marina CF20, CF40, CF60 and CF80 Canister Filters.Effectively Removes Heavy Metals, Odors, Discolorations, Organic Contaminants and PollutantsHigh Quality, Long Lasting Pelletized CarbonSafe for Freshwater and Marine AquariumsDoes Not Raise Phosphate Levels