Deep Blue Professional ADB41030 Perfect Blend in Jar with Media Bag, 22-Ounce Perfect blend is an essential mix of laboratory grade activated carbon and zeolite granules Safely removes odor, spent medication, discoloration in water and various toxins through absorption Also reduces harmful concentration of ammonia and other nitrogenous compounds while promoting colonization of beneficial bacteria Safe for both freshwater and marine aquariums Available in 22-ounce jar with media bag