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純(chun)水(shui)和超(chao)純(chun)水(shui)廣(guang)泛用(yong)(yong)于電廠(chang)、電子、醫藥、化工行業，通過各種膜的過濾或離(li)子交(jiao)換作用(yong)(yong)，將水(shui)中的有害離(li)子去除。電廠(chang)電廠(chang)多用(yong)(yong)的脫(tuo)鹽(yan)水(shui)，其脫(tuo)鹽(yan)水(shui)水(shui)質的主要指標為(wei)：硬(ying)度(du)約等(deng)于零，電導率≤0.2μs.cm，SiO2≤20ppb。化工廠(chang)化工用(yong)(yong)(yong)水(shui)(shui)多(duo)(duo)種多(duo)(duo)樣，通常水(shui)(shui)質不會(hui)比電(dian)(dian)廠(chang)水(shui)(shui)質要(yao)(yao)求(qiu)高，但可能會(hui)對(dui)(dui)(dui)某些(xie)離子有(you)要(yao)(yao)求(qiu)，所(suo)以(yi)(yi)常用(yong)(yong)(yong)一級(ji)或二級(ji)反滲透工藝(yi)。出水(shui)(shui)水(shui)(shui)質電(dian)(dian)導為(wei)5~10μs.cm以(yi)(yi)上。如有(you)更高的(de)要(yao)(yao)求(qiu)則后(hou)面加(jia)混(hun)床(chuang)(chuang)或EDI。醫(yi)藥(yao)醫(yi)藥(yao)用(yong)(yong)(yong)水(shui)(shui)多(duo)(duo)對(dui)(dui)(dui)電(dian)(dian)導和細菌(jun)(jun)作要(yao)(yao)求(qiu)，對(dui)(dui)(dui)系統所(suo)用(yong)(yong)(yong)材(cai)料材(cai)質有(you)要(yao)(yao)求(qiu)，多(duo)(duo)選(xuan)用(yong)(yong)(yong)不銹(xiu)鋼(gang)產品(pin)。通常純水(shui)(shui)后(hou)要(yao)(yao)加(jia)殺菌(jun)(jun)消毒(du)裝置(zhi)。電(dian)(dian)子行業(ye)電(dian)(dian)子行業(ye)對(dui)(dui)(dui)水(shui)(shui)的(de)要(yao)(yao)求(qiu)是(shi)最高的(de)，多(duo)(duo)數電(dian)(dian)子用(yong)(yong)(yong)水(shui)(shui)要(yao)(yao)求(qiu)達(da)到18兆。對(dui)(dui)(dui)電(dian)(dian)阻率的(de)要(yao)(yao)求(qiu)只是(shi)電(dian)(dian)子用(yong)(yong)(yong)水(shui)(shui)的(de)一小(xiao)部分(fen)，它對(dui)(dui)(dui)其中很多(duo)(duo)離子都有(you)較(jiao)高要(yao)(yao)求(qiu)，所(suo)以(yi)(yi)對(dui)(dui)(dui)安裝材(cai)料及管道有(you)特殊(shu)要(yao)(yao)求(qiu)。選(xuan)用(yong)(yong)(yong)工藝(yi)也是(shi)最復(fu)雜的(de)。通常要(yao)(yao)在EDI后(hou)加(jia)拋(pao)光混(hun)床(chuang)(chuang)及超濾、殺菌(jun)(jun)、氮封水(shui)(shui)箱等裝置(zhi)，造(zao)價(jia)也很高。