Activated carbon adsorption of electrolyte ions not only can also be ion exchange adsorption. Adsorption by activated carbon also enable the oxygen consumption of potassium permanganate (COD) by 15mg / L (02) down to 2-7mg / L (02), Furthermore, since the concentration of the surface adsorption of the adsorbed copied increases, and thus also serve to catalyze the removal of pigment in the water, smell, a large number of biological organisms, reducing the value of water and pesticide pollutants than halogen and remove the water trihalides (THM) and other pollutants. The system can be backwash, is a series of washing operations. Meanwhile, the device has a self-maintenance systems, operating costs low. Main functions: to ensure product water quality of equipment, extend equipment life