The continuous electro deionization (EDI
) process, is distinguished from other electrochemical collection/discharge processes such as electrochemical ion exchange (EIX) or capacitive deionization (Cap DI), in that EDI
performance is determined by the ionic transport properties of the active media, not the ionic capacity of the media. EDI devices typically contain semi-permeable ion-exchange membranes and permanently charged media such as ion-exchange resin. The EDI
process is essentially a hybrid of two well-known separation processes - ion exchange deionization and electro dialysis, and is sometimes referred to as filled-cell electro dialysis.