Fritz Carbon AG is an ultra-premium, 4x8 mesh granular activated carbon designed for both freshwater and saltwater aquariums. This expertly produced and acid-washed bituminous coal-based carbon utilizes a patended, high-pressure steam activation process, resulting in an individual granule structure of superior pore space. Each ounce of Fritz Carbon AG offers a vast, usable adsorptive surface area of over 300,000 square feet and has a superior mechanical hardness, pore volume, and chemical stability. It boasts efficacy in removing dissolved organic compounds, discoloration agents, chlorine, chloramines, and odors, all while not leaching phosphate into aquariums.