I have heard that as well.

I used PG solution initially and was surprised to see fluctuations...large fluctuations. I also noticed that the stock humidifiers were constantly molding, which I thought was not going to be an issue with the PG.

Once I moved on to distilled water for everything, I have never had a problem.

In my opinion, PG is a gimmick and not all that it is said to be.

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