I had problems sleeping due to the strong ozone smell the SoClean machine gives off after putting it on clean first thing in the morning. As many users recommended, I would lay the mask out after the cleaninging to "air it out" to try to get rid of the ozone smell before I would use it again at bed time. It still didn't matter. After multiple nights of doing this and not much sleep, I then started to research online about ozone and the health effects of breathing it. I found info on EPA.gov concerning ozone and air cleaners, among other sites, that do not recommend cleaners. I then emailed my pulmonary specialist and asked him about the SoClean and asked if he thought the ozone used to clean my CPAP would be safe to use, but he advised against it. That is all that I needed and returned my machine. The bottom line is that we need to stick to our guts and know that if something doesn't seem right, then it probably isn't! It may be easier to clean our CPAP equipment using these machines, but it's not worth our health doing so.