Activated carbon is one of the most useful materials in removing a wide range of pollutants in urban and industrial wastewater. As the most powerful absorbent in the world, it can remove a wide range of pollutants or contaminants. Activated carbon is employed in activated carbon filters for odor and color removal. Also, for enhancing the useful lifespan of ion exchange resins and membranes of water desalination device and their protection against chlorine present in water, activated carbon granule is used.