The Solution for chemical-free deionization


EDI is a revolution in chemical-free Deionization. This robust, modular electrodeionization (EDI) technology is cost-effective for all flow rates.

No regeneration chemicals
No hazardous waste stream
Simple, continuous operation
Reduced facility requirements
Flow rates up to 2000 gpm and beyond
Chemical-free deionization - E-Cell diagram

How EDI Works

Electrodeionization (EDI) removes ions from water using conventional ion-exchange resin. Multiple beds of ion-exchange material are arranged in narrow rectangular spaces contained between sheets of ion-exchange membranes. The deionization takes place in this resin bed, much as in conventional mixed bed ion-exchangers. Membranes allow for the delivery of pure water and the removal of impurities. The key difference between EDI and conventional DI systems lies in the method used for regeneration. In EDI systems, regeneration is achieved by using a DC voltage to create a current through the resin bed. Because each bead of resin touches an adjacent bead, the ions can migrate from one bead to the next, in the direction of the electrode, through the membrane, and are removed from the system with the concentrate waste stream.