Product review (5 stars): Use them and clean your unit properly every week
These keep my new Boneco humidifier clean. I change them weekly after descaling the unit with citric acid and hot water. Hopefully this will keep this machine going longer than the first Air-O-Swiss model 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 evaporator. Perhaps that degraded the seal. I wish Boneco offered a refurbishment service.