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Sand filter backwashing 20 Quartz sand filter it uses quartz sand as the filter medium, and at a certain pressure, the water with high turbidity is filtered through a certain thickness of granular or non-granular quartz sand, effectively intercepting and removing suspended matter, organic matter, gum particles, microorganisms, chlorine, sniffing smell and some heavy metal ions in the water, and finally achieving an efficient filtration equipment to reduce water turbidity and purify water quality.Purification classification of quartz sand filters for groundwaterQuartz sand filters are generally used as pretreatment of reverse osmosis equipment and UF equipment, mainly for interception and adsorption of sediment, colloid, metal ions and organic matter. Common filter materials are quartz sand, activated carbon, anthracite, manganese sand, etc. Filters that can use quartz sand as a filter medium for sewage purification are generally divided into two categories: one is a conventional quartz sand filter, also k