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Will the metal content of the electrolytes be completely used up at some point?
This varies from electrolyte to electrolyte. If the anodes are made of the same material as the salt in the electrolyte solution (e.g. copper, nickel, silver, zinc), the salt content remains constant because the anode dissolves slowly but steadily. However, the electrolyte is still contaminated at some point and brighteners (if present) are used up.