How long does it take until the electrolyte (KOH solution) is used up?

The electrolyte is not used up. As the KOH is only circulating within the machine, it remains in the system and does not get diluted after several refillings. However, the electrolyte will accumulate impurities and degrade during operation and therefore

January 11, 2022

The electrolyte is not used up. As the KOH is only circulating within the machine, it remains in the system and does not get diluted after several refillings. However, the electrolyte will accumulate impurities and degrade during operation and therefore needs to be exchanged once per year.