It takes 1-1/2 hours to complete the cleaning cycle not just a 1/2 hour as advertised. It's true that the machine's cycle takes 30 minutes, but you must also leave everything in the tightly sealed plastic cleaning zip bag for another hour to allow the ozone to revert to ordinary oxygen. According to the Clean Zone operating instructions, elevated concentration of Ozone is HARMFUL to your health. The instructions state that the Clean Zone does not remove skin oils or mucus from the mask, so it must be cleaned manually.
Bottom Line: No, I would not recommend this to a friend
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