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For EDI: 1-pass or 2-pass RO?

Electrodeionization today must be pretreated with RO for numerous reasons.  But what are the advantages and disadvantages of 1-pass and 2-pass RO as pretreatment? Many Electrodeionization (EDI) systems using Electropure™ EDI perform very well with 1-pass RO.  It’s easy to achieve 17+ Megohm with 1-pass RO.  Most USP WFI and Purified Water systems easily meet … Read more