Germ-Free Humidifier kills up to 99.99 percent bacteria, mold and spores. Design features a patented ultraviolet chamber, adjustable humidity control, multiple output settings, and dual tanks for easy filling. 2.0 gallon tank capacity lasts for up to 24 hours of operation per filling. Humidifier accommodates the use of inhalants to produce a medicated vapor that soothes irritated nose and throat membranes.