API Super Activated Carbon Black Magic(R) Super Activated Carbon media offers research grade carbon. This media helps keep the water clean and crystal clear. The patented activation process used in the production of the media yields a high purity, premium grade carbon with optimal pore structure and a large surface area for maximum adsorption. The unique design offers fast, continuous and thorough removal of odors, colors, organic pollutants, toxic compounds and medications. Features: . Offers a cleaner, healthier aquarium environment . Steam activated without phosphate . Ideal for freshwater, marine and reef aquariums containing sensitive fish, plants and invertebrates . Highly active, coal-based carbon Item Specifications: Size: 21 oz 44 oz