离线化学清洗可以基本消除膜丝内表面的污染，对于膜丝外表面的污染也具有显著效果。
Off-line chemical cleaning can basically remove the pollution on the inner surface of the membrane, and also effective for removing the pollution on the outer surface of the membrane.
基于膜元件三大指标的离散性，强调了离线膜清洗时元件出厂测试指标对于污染评价的意义。
Based on the dispersing of RO-membrane performance, significance of tested indexes of new elements in fouling-estimating was emphasized.
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