Ceramsite sand filter media are hard and rough in surface,porous inside the structure,and have the advantages of high mechanical strength,large specific surface area and porosity.When used in water treatment, Ceramsite Sand filters behave a activated surface property,a great amount of pollutant entrapment,less water head loss in the filter bed,lower consumption of back-flush water,stable in chemical and gbiologic property,and long service life.Ceramsite Sand filters is a new and efficient filter material to increase the water yield,upgrade the water quality,and save chemicals and energy.