I buy a Cpap machine from this site after reading their review. After using this for a few months I find it works well. The only concern I had was reviews said the ozone smell was a problem but after a few adjustments I found that after a cycle I rinsed the humidifier tank and refilled it with fresh water and also let it run for about 15 minutes it wasn't a problem at all. I recommend this to anyone who wants an easy way to sanitize your mask.