Quote:
Originally Posted by bobarian
Interesting. Splits can occur randomly although they can be an indication of high humidity. Sometimes with active humidification like yours the sticks closer to the source will be slightly higher rh. But as to the cause of the unwrapping at the cap I am stumped. If its just a stick or two maybe it was just a random occurrence, more than that I would look deeper for a cause.
This would depend on the type of humidifier. Active humidifiers like Oasis or Hydra's have a reservoir you fill when it runs dry. Gel or beads will turn color as they dry and require water. The other indicator would be when your rh drops below your desired level by 5% or more. 
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These humidifiers:

Bottom pic the humidifier is in the top middle section above the case.