Activated carbon filter, according to the adsorption characteristics of activated carbon, activated carbon is mainly used to remove pollutants in water, decolorization, filtration purification liquid, gas, also used for air purification, waste gas recovery (such as in the chemical industry for gas benzene recovery), precious metals recycling and refining (such as the absorption of gold). It is mainly made of activated carbon material with high carbon content, such as wood, coal, shell, bone, oil residue, etc.. And the coconut shell is the most commonly used raw material, under the same conditions, the activity of coconut shell activity of the active quality and characteristics is the best, because it has the largest surface. Activated carbon is a kind of multi aperture of carbon, is extremely rich in the pore structure has good adsorption properties, its adsorption by physical and chemical absorption adsorption force and the, appearance and color is black. The ingredients except carbon, it also contains a small amount of hydrogen, nitrogen, oxygen, its structure is shape like a hexagon, due to the irregular hexagonal structure to determine the more also body trifoliate orange and high surface area characteristics, per gram of activated carbon with the surface quite to more than 1000 square meters.