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.
Frequently asked questions
No. Carbon and sediment filters do not remove dissolved minerals.
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Hydrogen purity
Continue →Purity, tablets & bathing
- Hydrogen Bathing vs Hydrogen Tablets — Saturation versus dilution, compared in full.
- Hydrogen Water Purity — 99.991% certified purity from SPE/PEM electrolysis.
- Hydrogen Tablets: What You Should Know — What dissolving reactive material can leave behind.
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Source content adapted from guides/what-water-to-use-in-hydrogen-inhaler.