Coal based granular activated carbon is made from high-quality anthracite coal as raw material, refined using advanced technology, and produced using high-temperature steam activation technology. It is then crushed, screened, and finely processed into granular activated carbon. The appearance is black amorphous particles. It has advantages such as developed pore structure, large specific area, strong adsorption capacity, high mechanical strength, low bed resistance, good chemical stability, easy regeneration, and durability. It has a unique advantage due to its large specific surface area, especially the large volume of micropores. It has strong adsorption capacity for organic matter, free chlorine, and harmful gases in various types of water, and is an excellent adsorbent for deep purification of urban drinking water. It is also used to remove bacteria and toxic gas components in the air.