A Comparison of EDI Technologies

By Jeff Tate

Ion-exchange Mixed bed Reverse Osmosis Treatment technologies

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Electrodeionization (EDI) is the high-purity water treatment process that polishes reverse osmosis (RO) permeate without chemical regeneration. EDI has been in existence for more than 60 years, and has been commercially available for more than 27 years. Over time, EDI has become a proven and acceptable technology for all industrial water treatment users that require high-purity water. The process of operating an EDI system is extremely simple. EDI is continuous in nature and sometimes referred to as continuous electrodeionization (CEDI) or continuous deionization (CDI). There are several different commercially available EDI products with varying design, but all operate using the same principles of chemistry.

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