Product review (4 stars): Works great for V3100 Vicks Cool Mist Humidifier
These filters work great for my V3100 Vicks Cool Mist Humidifier.  Glad to be able to order them here on Amazon - convenient and price is decent.  The filters seem to last about 3months in our humidifier, which we use for our daughter (not daily, but often 2-3 weeks in a row every month or two).  It might last longer if we emptied out the water in the system when not in use.