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Now, something I have realized from scrolling through hundreds of reviews for other Levoit humidifiers and non-Levoit ones, most people don't know how to use humidifiers properly. First off, you need to read the instruction manual. There you will learn you need to use purified or distilled water. If you don't want to go and buy either of those from the store constantly, then don't use a humidifier. I buy distilled water in the jugs from the water aisle. This is especially important if you live somewhere with hard water. I live in Arizona and we have very hard water (and our house has no soft water filter), I used to use tap water in my old warm mist humidifier and there would be so much mineral build-up. I know better now. Apparently, if you use tap water in a cool-mist humidifier, it may cause white dust around the unit. But, since I use distilled I have not had this issue. You will also learn from the manual how and how often to clean it. You should clean it when it's brand new, you should change the water daily, and you should clean it every 3 days. There are also instructions to do a deep clean if necessary. I use vinegar to clean it as per the instructions every 2-3 days. Also, I make sure to clean every little corner and clean the inside of the top spout. I have seen SO many reviews where people complain of mold (in other models) and this is almost always because they aren't cleaning their humidifier enough or cleaning it properly. I saw a one-star review and the entire base and inside were filled with dark green mold, they said they hadn't cleaned it in 3 weeks! That's crazy! Please don't do that! As long as you take care of your humidifier, use it right, and clean it right you will have no mold problem.
I have had it for 2 weeks now. I live in Arizona so it's about 5% humidity here. My skin is so dry and after coming back from a Caribbean vacation (where it is very humid), I knew I needed more moisture in the air and this humidifier has done the trick. My skin is doing so much better now. I also have pretty bad allergies and my nose feels much less dry all the time, too which is nice. I highly recommend it!!!