I should note that my problems with sinus infections were most likely caused by lack of humidification because of the passover type humidifier rather than using the tap water. My new machine gave out this weekend and I've had to go back to my old passover type humidifer and have woke up with headach...

I had a hard time finding the article that you referred to at the beginning of this thread... the actual article is at http://www.chestjournal.org/cgi/content/abstract/128/4/2138 It is interesting... but the article refers only to heated convection type humidifiers and not to some passover humidifie...

Don't give up...... I had the same problem... took me several months in fact to actually get used to using the cpap. Many nights I would wake up after having ripped the mask off, plus the hose kept getting in the way. My Dr. told me to find some way to adjust the hose so that it was over my head.. I...

I don't buy that there are no problems in using tap water...

I travel a lot... several times when I've had to use tap water I've gotten sinus infections.

So I do my best to always get either distilled or at least bottled water.