Kolar Filtration Crystal Cal Carbon is a high-quality, laboratory-grade granular activated carbon specifically formulated for optimal water purification in aquariums. This sub-bituminous, true liquid phase carbon effectively removes a wide range of pollutants, ensuring crystal clear and healthy water conditions for your aquatic inhabitants. It works by adsorbing dissolved organic compounds and other impurities that can cloud water and degrade water quality. Unlike inferior pelletized carbons designed for air purification, Kolar Filtration Crystal Cal Carbon is a true liquid phase product optimized for water. It features a 4x12 mesh size with very low dust, ensuring ease of use and immediate effectiveness after a quick pre-rinse to remove any shipping dust. This versatile carbon is safe for use in all aquarium types, including saltwater and freshwater setups, as well as ponds, and can be easily deployed in media reactors, filter bags, or canister filters. Proudly made in the USA by a family-owned and operated company, it offers reef aquarium quality performance. This activated carbon is ideal for any aquarist seeking to achieve and maintain pristine water clarity and quality in their reef, saltwater, or freshwater aquarium. Its laboratory-grade purity and specialized formulation make it a superior choice for removing yellowing compounds, odors, and other dissolved organics that can impact coral health and fish well-being. By utilizing Kolar Filtration Crystal Cal Carbon, hobbyists can provide a healthier, more visually appealing environment for their aquatic ecosystems.