Appts for continuous electrolytic purificn of electrolytes has cathodes and anodes having the same surface area and arranged parallel to each other to define narrow passages through which electrolyte is forced. Pref. the anodes are of graphite or platinised titanium, and cathodes are interchangeable or regenerable possibly of steel sheet. The appts. may include a stack of alternating anodes and cathodes with interchangeable spacers.
