Electrodeionization is a water treatment technology that utilizes electricity, ion exchange membranes and resin to deionize water and separate dissolved ions (impurities) from water. It differs from other water purification technologies in that it is done without the use of chemical treatments and is usually a polishing treatment to reverse osmosis (RO). There are also EDI

 units that are often referred to as continuous electrodeionization (CEDI) since the electric current regenerates the resin mass continuously. CEDI technique can achieve very high purity, with conductivity below 0.1 µS/cm. Recently, Argonne National Laboratory developed a process called Resin-Wafer Electrodeionization (RW-EDI), which uses a unique porous resin wafer mold made from immobilized loose ion-exchange resin beads.

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