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純(chun)水和超(chao)純(chun)水廣泛(fan)用于(yu)(yu)電(dian)廠、電(dian)子(zi)(zi)、醫藥、化工(gong)行業(ye)，通過各(ge)種膜的(de)過濾或離子(zi)(zi)交換(huan)作用，將水中(zhong)的(de)有(you)害(hai)離子(zi)(zi)去(qu)除。電(dian)廠電(dian)廠多用的(de)脫(tuo)鹽(yan)水，其脫(tuo)鹽(yan)水水質的(de)主要指標為：硬度約(yue)等于(yu)(yu)零，電(dian)導率≤0.2μs.cm，SiO2≤20ppb。化工(gong)(gong)廠化工(gong)(gong)用(yong)(yong)水(shui)(shui)多(duo)(duo)(duo)種(zhong)多(duo)(duo)(duo)樣(yang)，通常(chang)水(shui)(shui)質不會比電(dian)廠水(shui)(shui)質要(yao)(yao)(yao)(yao)求(qiu)(qiu)高(gao)，但可能會對(dui)某(mou)些離子(zi)有要(yao)(yao)(yao)(yao)求(qiu)(qiu)，所以(yi)常(chang)用(yong)(yong)一級(ji)(ji)或(huo)二級(ji)(ji)反滲(shen)透工(gong)(gong)藝。出水(shui)(shui)水(shui)(shui)質電(dian)導(dao)為5~10μs.cm以(yi)上。如有更高(gao)的要(yao)(yao)(yao)(yao)求(qiu)(qiu)則后面加混床(chuang)或(huo)EDI。醫藥醫藥用(yong)(yong)水(shui)(shui)多(duo)(duo)(duo)對(dui)電(dian)導(dao)和細(xi)菌作(zuo)要(yao)(yao)(yao)(yao)求(qiu)(qiu)，對(dui)系統所用(yong)(yong)材(cai)料(liao)材(cai)質有要(yao)(yao)(yao)(yao)求(qiu)(qiu)，多(duo)(duo)(duo)選(xuan)(xuan)用(yong)(yong)不銹鋼產(chan)品(pin)。通常(chang)純水(shui)(shui)后要(yao)(yao)(yao)(yao)加殺菌消毒裝置。電(dian)子(zi)行(xing)業電(dian)子(zi)行(xing)業對(dui)水(shui)(shui)的要(yao)(yao)(yao)(yao)求(qiu)(qiu)是(shi)最(zui)高(gao)的，多(duo)(duo)(duo)數電(dian)子(zi)用(yong)(yong)水(shui)(shui)要(yao)(yao)(yao)(yao)求(qiu)(qiu)達到18兆(zhao)。對(dui)電(dian)阻率的要(yao)(yao)(yao)(yao)求(qiu)(qiu)只是(shi)電(dian)子(zi)用(yong)(yong)水(shui)(shui)的一小(xiao)部(bu)分，它對(dui)其中很多(duo)(duo)(duo)離子(zi)都有較高(gao)要(yao)(yao)(yao)(yao)求(qiu)(qiu)，所以(yi)對(dui)安裝材(cai)料(liao)及管道有特殊要(yao)(yao)(yao)(yao)求(qiu)(qiu)。選(xuan)(xuan)用(yong)(yong)工(gong)(gong)藝也(ye)是(shi)最(zui)復雜的。通常(chang)要(yao)(yao)(yao)(yao)在EDI后加拋光混床(chuang)及超濾(lv)、殺菌、氮封水(shui)(shui)箱等裝置，造價也(ye)很高(gao)。