Check out this article in Ultra Pure Water Magazine written by our own Fred Wiesler. Here is a preview :
Electrodeionization (EDI) technology has evolved over the last 30 years to become a recognized process for final polishing of RO permeate water. In the first years of its development, pretreat-ment was not so well understood by the early adaptors of the technology, which meant challenging feedwater quality was sent to early electrodeionization units. Because of this, the technology was reported to be unstable and prone to scaling and fouling. This impacted the penetration of the technology and delayed its widespread entry into the water treatment market.
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