The activated carbon adsorption process is to remove organic matter in water. Due to the abundant source of raw materials and large surface area, it has a good removal rate of color, smell, taste and other organic matter. Activated carbon is increasingly widely used in water treatment processes. Among them, powdered activated carbon is particularly effective in removing low molecular weight DOC produced by algae cell secretions in the water, and can effectively remove microcystins in the water. Adding an activated carbon filter after the classic slow sand filter can remove the water odor. Taste of organic matter.