Humid Basement

[bobtherealtor]

I have a large ranch., which gets humid in the summer.
I have noticed that there are some really small white marks ( almost looks like baby powder) marks on the ceiling rafters in the basement. I keep a de-humidifier going in the basement.
Is this a form of mold and are there any suggestions as to make this go away. Its really not bad, you can only see it in bright light

[airman.1994]

you could clean it up with any type of home cleaner.

[m159267]

If the dehumidifier is doing its job you should not have a mold problem. Are your cold water pipes sweating? I recommend buying a humidity gage and measure the moisture level in your basement. You want to keep the humidity below 60%. Perhaps the white spots originated prior to the addition of a dehumidifier.