Profile: Zhengzhou Yihang Water Purification Materials Co., Ltd specializes in activated carbon. Our products are widely used in water and waste gas purification industries. Our main products include pellet activated carbon, granular activated carbon, powdered activated carbon,honeycomb activated carbon, mainly used for water purification, air purification, gold smelting, food and drug industries. Columnar activated carbon is a porous carbon material, its highly developed pore structure makes it has a large surface area, so it is easy to fully contact with toxic and harmful gases in the air (harmful impurities).