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+--- Thread: Caked Residue In CPAP Water Reservoir, Is It Normal? (/Thread-Caked-Residue-In-CPAP-Water-Reservoir-Is-It-Normal)
Caked Residue In CPAP Water Reservoir, Is It Normal? - Kamryn - 08-29-2024
I noticed it when I went to dump water out. I'm unable to load a picture because it is too big.
Update: it appears to be limescale from bottled water. I was worried it was mould or something and someone mentioned legionaries disease which got me concerned to say the least.
RE: Caked Residue In CPAP Water Reservoir, Is It Normal? - G. Szabo - 08-29-2024
You should use distilled water or at least boiled and filtered water.
RE: Caked Residue In CPAP Water Reservoir, Is It Normal? - Big Guy - 08-29-2024
Use some white vinegar and let it soak for 30 minutes or so. That will completely dissolve the calcium / mineral build-up. I quit using distilled water years ago. I now just use tap water.
RE: Caked Residue In CPAP Water Reservoir, Is It Normal? - Rickyricardo - 08-30-2024
Plain vinegar works, cleaning vinegar works better and with less of it, and CLR (buy the generic) works well with even less, with a good rinse.
Bottled water may have more minerals than city water. A lot of it is sold with minerals as a feature.
Mostly it's limescale, which is calcium carbonate and easily dissolved with an acid.
Legionnaires disease or any bacteria would not grow on a metal plate such that you'd see it if at all. Light pink will also be a bacteria (not a fungus e.g. mildew) which would go away with vinegar or bleach or just soap and water.