Ultra-clean, ultra-quiet, our UV humidifier kills up to 99.99%* of tap water-bred germs. It emits a soothing, purified warm mist to help keep your home more comfortable during dry winter months. Better still, it's filter-free, so you never have to worry about finding replacement filters in the middle of the winter to run your humidifier. Ultra-quiet operation makes it a perfect choice for use in bedrooms. Runs up to 3 nights or 24 hours per filling. Order yours from Brookstone today! Here's how our warm-mist UV humidifier works: 1) Tap-water germs are destroyed in a built-in UV light chamber. 2) Purified water then enters a boiling chamber. UV light and boiling work together to ensure up to 99.99%* germ-free moisture. 3) Purified moisture humidifies the air around you. Don't suffer a dry, uncomfortable home one more day. Order your Brookstone Germ-Free Humidifier with built-in UV sanitizing light right now. * SGS Test Report 001;017918/4. Based on Independent Laboratory Testing report. Results are based on the reduction of the following: i. After 5 minutes of continuous use, kills up to 99.999% of listed bacteria, mold, and mold spores that can exist in tap water. (1.) P. aeruginosa; (2.) E. coli; (3.) S. auerus; and (4.) A. nigerii. After 60 minutes of continuous use, kills up to 99.999% of listed mold and mold spores that can exist in tap water. (1.) B. stearothermphilus.iii. In laboratory testing, reduced endotoxins in humidifier steam by 99%.