Product review (3 stars): Okay, doesn't last long
These work fine with my humidifier, however they get moldy SUPER quick. Every one I've used has gotten mold after a few days of use, even after removing, rinsing, and letting air dry in between uses (e.g. run two full tanks, rinse and dry, run two more times, mold). I'll be looking for the 'real' filter but if I can't find it, I'll probably use these again just for convenience.