Expert: James Yee - 2/27/2008

Question
I recently received a new humidor as a gift.  I followed the instructions for "proper use" when I set up my humidor.  I have recently discovered that there is a white fluffy substance growing on my humidifier.  I do not have a sponge in my humidifier, I believe it is an acryl polymer humidifier.  I have read some other questions similar to mine, but I cannot get to the growing substance to see if it is the consistency of flour or corn starch.  But, it is a white or gray color and is contained within the humidifier.  Is this a problem?  Am I using the wrong type of distilled water?  Or is this the normal function and I am just blowing things out of proportion?  Any help would be appreciated.  Thank you,

Bruce

Answer
Hi Bruce,

If the substance is contained within (or growing on) the humidifier, then it is most likely mold caused by either high humidity, the use of contaminated water, or water that is not 100% distilled (such as boiled, tap or bottled drinking water).

First, check your humidor's humidity level.  The ideal range is 67-74% humidity.  If your humidity is 75% or greater, what you should do is switch to a foam-core/sponge humidification unit and use a 50/50 Propylene Glycol and distilled water mixture.  This will balance your humidity out at 70% (the perfect level) which should prevent the white substance from forming.

Polymer-based humidification devices (such as humidor crystals and gels) generally do provide a better humidity level and are less susceptible to bacteria.  If your polymer humidifier uses polymer "crystals", you can try to save your humidifier and thoroughly flush out the mold with distilled water (use LOTS of distilled water).

Also, be sure that you're using 100% distilled water or "bidest" water (which is double-distilled).  Using any other type of water can cause mold and mineral trace to grow which could damage your humidifier.

Hope this answers your question.  If you have any more questions, please feel free to just ask and I'll be happy to help.

Regards,
James