Full Article: Fundamentals Of Electrodeionization (EDI) Technology

By Chris Gallagher

Reprinted with permission of Water Conditioning & Purification Magazine ©March 2007
Any reuse or republication, in part or whole, must be with the written consent of the Publisher.

Electrodeionization (EDI) has matured and grown in popularity since its first commercial introduction over 18 years ago. The technology can replace mixed ion exchange in many applications using a chemical-free process to produce high-quality water; however, the water quality fed to the EDI system is generally reverse osmosis permeate. Because of the competitive nature of the business, better manufacturing and improved designs, the price of EDI has dropped over 60 percent in the years since its inception, making it a competitive option.