This product is mainly used for sand factory, electric pole factory, worksite of building and concrete dam to wash, classifying and de-watering various sands. This sand washer adopt inclination of 15°, under the water tub, three weir plates form the sediment pool. The screw head is immersed in this pool, and the screw is driven by electric motor through reducer rotating continuously, and then the fresh water is feeding from porous plate at bottom of sediment pool, this machine are three functions of washing, de-watering, and classifying.