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Why do I smell ozone in my mask at night when the unit ran in the morning? Is that safe?

What you smell is not ozone; the equipment is being oxidized and that is what you smell. It is completely safe. Some suggestions to lessen the smell:

1) Have you used the pre-wash?

2) Set the time back to 5 minutes or less.

3) Blow air from the CPAP through the mask before using it.

4) Do not use fragrance wipes or anything else with a fragrance in it to clean your equipment as this will intensify the smell.

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