I bought humidifier because inside of my room became drier now a day. Last year I bought it but it did not work this year. Perhaps I did not clean it before I finished using last year. I cleaned it again and again last week but it did not work well. So, I gave up to clean it up. I went to "Bed Bath & BEYOND(http://www.bedbathandbeyond.com/default.asp?order_num=-1&)" and bought pretty one. I like it very much.