Electrodialysis is a membrane-based process that uses electrical driving force. In this process by using alternating Anion–selective membranes (AMs) and Cation-selective membranes (CMs), situated between an Anode (+) and a Cathode (-), the separation of ions happens. Applied electric field, anions and cation will move towards the Anode and Cathode, respectively.  Anions are stopped by the CMs and the cations by the AMs, creating a process low ion concentration flow (Dilutant) and a process flow with high ion concentration  (Concentrate).  The process is shown in the below figure.

In electrodialysis, the charged suspended solids increase the resistance of the membrane dramatically, are deposited on the membrane surface over the time.  By reversing the polarity of the applied electrical potential in certain time intervals can eliminate to a large extent by reversing will result in a removal of charged particles that have been precipitated on the membranes. This technique is referred to as electrodialysis reversal (EDR).




  • Large scale brackish and seawater desalination and salt production.
  • Small and medium scale drinking water production such as towns & villages, construction & military camps, nitrate reduction, hotels & hospitals.
  • Pre-demineralization such as  boiler makeup & pretreatment, ultrapure water pretreatment, process water desalination, power genration
  • Food processing and agricultural water  for greenhouses  livestock and irrigation
  • Glycerin purification


WaterSafe is a distributor of GE Aquamite* EDR Systems

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