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Organics in many types of raw water, its composition is very complex, organic pollution for the RO system formed by means of organic pollution dissolved in water, is the industry's most let RO headaches! There are some people mistakenly believe that the ultrafiltration (UF) is only a small amount of high molecular weight organic compounds in water shutoff or ultrafiltration membrane filter pore size larger than the non-dissolved organic matter, most of the organic matter in the water because of its small molecular weight, and through Ultrafiltration (UF) H stopped after the RO membranes, and also cause fouling RO membrane. The main manifestations are adsorbed on the surface of the RO membrane formation of the organic thin film layer, and because most of the role of uncharged organic matter, can be more firmly attached to the surface of the membrane. Organic pollution can quickly lead to severe recession RO membrane performance, such as desalination RO membrane filtration, water filters produce quick play magnitude lower, especially after the cleaning effect of organic pollution is weak. Is almost irreversible.