[webnrrd2k]

It's really not a big deal to use tap water, I did for years until I lost enough weight that my sleep apnea went away.

1.) Fill the tank with regular cheap vinegar to get rid of the mineral deposits. Maybe there is a problem with some tanks, but mine were all plastic or stainless steel and vinegar didn't seem to have any affect on them.

2.) Usually the tanks hold enough water for two nights, maybe a little more, at the settings I used them at. Dumping out the water in the morning kept the mineral content from becoming concentrated due to evaporation, and kept the buildup down to more manageable levels. If I didn't dump the tank every morining then I have rapid mineral buildup. I know it sounds silly, but it took me an embarasing amout of time to figure this out.

Once I worked out those two things I had no trouble with using regular tap water in the humidifier.