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Industrial Water Filter Automatic Backwash Pressure Sand Filter Quartz Sand Media Filter for Seawater Desalination Water Treatment/Drip Irrigation System, Find Details and Price about Sand Filter Irrigation Sand Water Filter from Industrial Water Filter Automatic Backwash Pressure Sand Filter Quartz Sand Media Filter for Seawater Desalination Water Treatment/Drip Irrigation System - Hunan Dawning Environmental Protection Equipment Co., Ltd.