High purity water production has traditionally used a combination of membrane separation and ion exchange processes.

Electrodeionization, EDI is a advanced technology combines membrane system with ion-exchange resin to provide a high efficiency demineralization process by using electricity as driven force for semiconductor, pharmaceutical and general industry.

EDI system utilizes an electrode by current supply to ionize water molecules and separate dissolved solid (TDS) from RO permeate water to produced high purity water.