AquaClear Activated Carbon Filter Inserts feature ultragrade activated carbon that will improve your aquariums water color clarity and odor without changing the waters characteristics. Safely removes chlorine smoke and aerosol spray contaminants. AquaClear Premium Research Grade Carbon Inserts Absorbs odors discoloration and impurities Improves aquarium water quality AquaClear Activated Carbon Insert superior adsorption of impurities and broad spectrum organic compound removal make it one of the best inserts in the market. Supports beneficial bacterial colonies and can be used in both fresh and saltwater aquariums. Specifications 20 Gallon 5 20 gallon aquariums 30 Gallon 10 30 gallon aquariums 50 Gallon 20 50 gallon aquariums 70 Gallon 40 70 gallon aquariums 110 Gallon 60 110 gallon aquariums