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Don’t fill the reservoir past the second line or you will get droplets. You can also lower the humidity/temp or use mouth tape.
also make sure the unit is lower than your bed. If its higher its an issue.
for supplies cpap.com if often cheaper unless your insurance covers supplies. Mine doesn’t.
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I used to get rainout before the heated tube. I installed a heated tube and turned down the humidity and no more rainout in the tube or facemask.
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As pavin69 says.....
"Breathing thru your mouth is why you have dry mouth. No temp or humidity setting will fix that."
I have been using a cpap for 25 years, I must tape my mouth shut to stop the leak. It's not like it sounds, and gets the job done. Water proof tape (3M) and a self adhesive ACE 2" wide bandage to hold the tape in place.
After stopping the excess air flow through my mouth, no more dry mouth. Also, I use no water or heat.
Hope my story helps on your hunt to solve your problem.
As with many things, you have to want this to work.
Best,
Brunt