Why Distilled Water in CPAP? (Is It Necessary?)

Unlike filtered or tap water, distilled water does not contain minerals. That’s why it is safe to use distilled water in your CPAP humidifier. Distilled water does not contain harmful bacteria.

The life of your CPAP machine decreases due to tap water. Distilled water does not damage your CPAP humidifier. Why does distilled water not contain minerals? That’s because distillation removes minerals and other impurities from water.

What happens if you use tap water in your CPAP machine? The impurities build up in your machine. These impurities may include minerals and chemicals. Your CPAP machine may not function properly due to tap water.

Key Takeaways

  • Distilled water does not contain minerals.
  • Tap water can contain harmful minerals and bacteria for your CPAP.
  • RO water can be used inside CPAP because it does not contain harmful minerals and bacteria.
  • Hard water is not suitable for your CPAP machine.

What can I use instead of distilled water in my CPAP?

You can use RO water in your CPAP. RO plant removes 90-99% of impurities from water. In other words, RO water does not contain minerals and microbes that can build up in your CPAP humidifier.

You can use demineralized water in your humidifier. Both RO and distilled water do not contain minerals for your CPAP machine. Unlike tap water, they do not build up residue in your CPAP machine.

I used tap water in my humidifier. What should I do? The answer to this question is simple. You have to thoroughly clean your humidifier. Your CPAP needs deep cleaning because it removes excessive mineral deposits inside your humidifier.

Is distilled water necessary for CPAP?

No, but it is best for CPAP. Distilled water is not necessary because you can use different forms of demineralized water in your CPAP. In case you do not have distilled water, you can use RO water.

Final Thought

Distilled water is considered best because it does not contain harmful minerals and microbes for your CPAP machine. You can use RO water instead of distilled water. Just in case you do not get distilled or RO water, you can use tap water in your CPAP humidifier once in a while. However, you will have to deep clean your CPAP machine after using tap water.


This is my blog about the ways and solutions that can help you improve your health by taking more value from drinking water. As improving health means a lot to me, I decided to create the Water On Top project with the purpose to reveal the benefits of water, the finest products to take our daily water to another level, and much more great stuff about water that I believe is on top of our nutrition.

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