Key takeaways
- Use distilled or deionised water only.
- Tap, spring and filtered waters leave mineral deposits on the membrane.
- Mineral scale reduces output and shortens membrane life.
Why purity matters
PEM membranes are designed to ionise pure H₂O. Dissolved minerals plate onto the catalyst layer, reducing active area and output.
Distilled water is the safest universal choice. Deionised water performs identically. Reverse-osmosis is borderline; double-check the TDS reading.
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Source content adapted from guides/what-water-to-use-in-hydrogen-inhaler.