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Otis automatic shallow spill sand filter is composed of multiple standard rapid sand filter unit, which has a unique water and water collectors, automatic flush valve has a unique two-way, multiple standards in the normal system operation can be realized in the rapid sand filter backwash individually, automatic process control. With small backwash water, equipment is easy to install, easy advantage of the flow of equipment, maintenance-free. According to different user requirements, there are two series of vertical and horizontal, suitable for industrial and domestic water treatment in circulating water system.