Electrodeionization (EDI) is an electrically-driven water treatment technology that uses electricity, ion exchange membranes, and resin to remove ionized species from water.
The ion exchange beds in the EDI systems are regenerated continuously so that they do not exhaust in the same way as ion-exchange beds that are operated in batch mode. Typically product water resistivity of >15 MΩ.cm is consistently achieved using this process. As well as the practical advantages and reduction in down-time of avoiding changing cartridges, EDI can also deliver more consistent purity than resin type ion-exchange systems.