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Why does the HumidX need to be thrown away after 30 days of opening?
It stores bacteria once you breathe through it.
If the HumidX was not used every day during the 30-day period or used only for a week, it must still be replaced. It is a manufacturing recommendation that it must be replaced at 30 days of opening. When you breathe through it, be it once or 10 times, it is storing bacteria hence the manufacturer recommendation.