Product review (2 stars): Okay, but half strength.
BestAir is okay, but it has exactly half the volume of the exact same main ingredients as the bacteriostat from Holmes, which is also sold on Amazon.  I don't understand why Bestair gets so many rave reviews and Holmes so few.  They are the same product, but you need to use twice as much of the Bestair.  I don't work for Holmes, I promise.