Electrolysis system having an auxiliary ion exchanger

An electrolysis system for electrochemical generation of hydrogen and oxygen, comprising:

• multiple electrolytic cells, each of which comprises an anode chamber containing an anode and, on an opposite side separated by a membrane, a cathode chamber containing a cathode, wherein a voltage can be applied as intended between anode and cathode;
• and
• an anode-side water circuit which runs from an anode-side outlet to an anode-side inlet of the anode chambers and comprises an oxygen separator and a main pump and a cooling device;
• and
• an anode-side substream branch which runs from a branch-off point to a collection point in the anode-side water circuit and comprises an auxiliary ion exchanger, wherein the branch-off point is arranged downstream of the main pump and the cooling device and upstream of the anode-side inlet of the anode chambers in the direction of flow;
• characterized in that the collection point is arranged downstream of the anode-side outlet of the anode chambers and upstream of the oxygen separator in the direction of flow.