Activated carbon is a very fine carbon particle per unit area has a large microporous, usually we call him capillary hole. This capillary has a strong adsorption capacity, due to the large surface area of carbon particles, in full contact with impurities in water. These impurities can be adsorbed in the micropores, thus removing impurities such as colloidal water. Activated carbon can adsorb CL ions and ozone, organic matter in water also has certain adsorption capacity, can significantly on water pigment adsorption, in general we require iodine value above 700mg in the water treatment industry, the activated carbon adsorption ability.