This session will explore how continuous water-quality monitoring supports efficient and reliable alkaline electrolyser operation. It will focus on key parameters such as conductivity, CO₂-reduced conductivity, TOC, silica, ionic impurities, KOH concentration and cooling-water indicators.

The presentation will show how impurities affect electrolyser efficiency, gas quality and lifetime, including carbonate formation, catalyst poisoning, increased resistance and diaphragm blockage. It will also highlight why trend-based online monitoring is more effective than grab sampling in dynamic renewable-energy operation.

Economic considerations will be discussed, showing that investment in analytics is small compared with total electrolyser CAPEX, while inadequate monitoring can lead to significant maintenance costs, downtime and equipment damage. A practical case study and data-led examples will illustrate the operational and financial impact of poor water quality.