Electro-Deionized (EDI) Water Treatment Skids

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Tel: 1.888.569.2837
Email: information@nancrede.com


What is Electrodeionization (EDI)?
Electrodeionization (EDI) is a process that utilizes electricity, ion exchange membranes, and resin to deionize water and separate impurities from water. When fed with water that has low TDS (total dissolved solids), the resulting water can achieve high levels of purity.

What is Continuous Electrodeionization (CEDI)?
Continuous Electrodeionization (CEDI) differs from Electrodeionization (EDI) in that the electric current regenerates the resin mass continuously. As a result, CEDI can achieve very high levels of purity.

Does EDI utilize chemicals?
No, EDI is a chemical-free process that relies upon electricity.

What are the applications of Electrodeionization (EDI)?
Industrial applications of EDI include water for pharmaceuticals, electronics, and power generation. Most commonly, EDI may be used as a polishing treatment for the water produced by reverse osmosis.

What are the advantages of Electrodeionization (EDI)?
Electrodeionization (EDI) eliminates the need for hazardous chemicals and thereby avoids the production of hazardous waste.

How does Electrodeionization (EDI) work?
Electrodeionization (EDI) works by passing water between an anode and a cathode. Ion-selective membranes allow the ions to separate from the water with the result being high purity water.

Overview of our EDI Electro-Deionized Water Treatment Skids

Our skids that utilize the electro-deionization (EDI) process provide cutting-edge industrial water deionization treatment that produces ultrapure water. Our electro-deionization skids use ion-exchange resins via a DC voltage potential to remove contaminants (cation and anion) from your feed water supply.

Then ion-selective membranes are used to continuously remove these contaminants via a small concentrate stream. The voltage applied across the cell allows for constant regeneration without chemicals, wastewater neutralization or disposal, or shutdown time. This can make this a useful alternative to traditional industrial deionization systems.


  • AB MicroLogix Series PLC system
  • AB PanelView operator terminal
  • DC Power supply – rectifier unit
  • NEMA-4 electrical enclosures
  • Electric-actuated inlet water valve
  • Individual electro-deionization cell sampling ports
  • Product water resistivity monitor
  • Flowmeters for the product, reject, & electrolyte streams
  • Feedwater pH monitor

Optional Equipment:

  • Product water divert valve
  • Alternate PLC systems
  • Electro-deionization cell clean-in-place systems
  • CPVC piping
  • Feedwater resistivity monitor
  • System pressure transmitters
  • Product water pressure relief valve
  • Two-pass RO pretreatment
  • Feed – product water storage tanks
  • Feed – product water transfer pump systems

Also see our Electro Deionizer Systems

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