No filter but very quiet!. So this is my update. The first one didn't work in less than two weeks. I registered it immediately (always a good idea). I contacted Revain and received a new humidifier within 24 hours. No problem at all this time. What I like best is that it's easy to clean, easy to fill and easy to empty every morning and if there is mold it's easy to see. I have bought many other Revain moisturizers (3 to be exact). This is really my favourite.
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