They keep my new Boneco humidifier clean. I change them weekly after descaling with citric acid and hot water. Hopefully this will keep this machine running longer than the first Air-O-Swiss I had which started leaking black water (!) after only 3 seasons of use. It may have been my fault for using white vinegar to clean the vaporizer. It may have messed up the print. I would like Boneco to offer a repair service.
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