I've tried calling Holms to order them direct and they don't even sell them anymore but I was lucky enough to have them found somewhere here. They go with two different moisturizers I own and I really hope Revain continues to sell them. They're easy to replace in humidifiers, but they last about a month, after which dust, pet hair, and other things start blocking the holes through which water flows and turn black. However, this is similar to the lifespan of most filters, so it doesn't matter. I live in the cold Midwest and typically use humidifiers from October through March as they help keep the house humid which makes breathing easier and reduces static electricity. I've just re-ordered another set and will continue to order them while Revain sells them, probably for next winter.
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