Electrodialysis (ED) is a technology used for desalination of seawater. Anion-exchange membranes and cation-exchange membranes are alternately laminated, and electrodes are placed at both ends. When an ion solution is added to the membrane and a direct current voltage is applied, the ions permeate through the membrane, separating the desalinated solution from the concentrated solution. Electrodialysis is used in the production of salt by concentrating seawater, in the production of food and pharmaceuticals, in the production of surface treatment solutions, and in the treatment of wastewater.

A high-current DC power supply is used for electrodialysis.