Product review (5 stars): These seem to work, however, I have to ...
These seem to work, however, I have to double them up in my humidifier. They are much thinner than the original ones that came with my unit. The heat pad where the water is heated, stays cleaner for a lot longer when these are in there. But still, if you have hard water in your area, you're still going to get the white dust and mineral buildup no matter what you use.