Water Quality Is Not Optional
Electrolysers are sensitive to impurities that can accelerate degradation, affect performance, and reduce gas purity. A major review summarises impurity sources, mechanisms, and mitigation strategies across electrolyser types.
Practical Guidance
If hydrogen purity is critical (e.g., for fuel cells or sensitive processes), plan for drying/filtration appropriate to your downstream use and confirm specs for your exact configuration.
Use the water grade specified for your model (often deionised or appropriately purified water, depending on the system).
Treat water purification and maintenance as part of the operating cost, not an afterthought.
