Electrodialysis is an ion-exchange process that uses an electric field to move ions across a series of selective membranes, separating them from the bulk solution. This method is particularly suited for applications that require controlled removal of dissolved ions, such as desalination, brackish water treatment, and industrial effluent processing. Electrodialysis can be adjusted to recover specific ions, making it a versatile choice for situations where resource recovery is also a goal. With careful configuration, it offers energy-efficient solutions for creating demineralised water, desalinating seawater, or treating effluents, while enabling the reuse or recovery of valuable ions.