This winter I had three Cool Mist humidifiers at home. Everything is covered with fine white powder. Especially plastic items. They are like dust magnets. I had to keep wiping everything. We even have a working HEPA air purifier, which I might add is also full of dust. So I threw two of these cartridges (mostly carbon filters) in my large humidifier and one in each of the other smaller ones and it shrunk a lot. Dust. That doesn't stop, but it severely limits. I would say about 80 percent. Highly recommended.
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