污染指数（SDI）值是测定反渗透系统进水的重要指标之一。是检验预处理系统出水是否达到反渗透进水要求的主要手段。它的大小对反渗透运行寿命有着致关重要。 Zhejiang DD Water Industry Co., Ltd. is specialized in water treatment equipment and RO fittings.Our main products include all kinds of RO faucets and fittings、EDI、SDI、large flow security filter、fountain nozzles and sprayers.It covers more than 100000 ㎡ with 30000㎡ for manufacture. It owns the ability of producing、designing、developing. Including the water treatment, advanced imported automatic punch、product lines of fusion casting、forging and stamping、polishing、electroplating、assembling、testing. Our production scale is the market leader in purified water faucet field. It is also one of the first companies who research domestic EDI module and whole machine in module separating field.We have more than 10 years experience of developing、producing and sales, including RO、NF、ultrafiltration、micropore filtration、domestic EDI module and equipment. Based on its mature technology and professional team, from 2006 to 2008, Dongda became a member of drafting committee of <Module equipment & model naming>、<Electronic deionisation module components>、<EDI purified water equipment>. Dongda is guaranteed by ISO9001︰2000 Quality Management System Certificate and ISO14001 Environmental Management System Certificate. Products are sold to European、American、Middle East、Korea、Taiwan、Russia, etc. Adhering to the purpose of “Clients First, Reputation First”, we service clients home and abroad by offering high quality products firmly. You are welcome to call us or visit our factory to negotiate about cooperation.