Focusing on innovative, natural approaches to improve your air quality, PureGuardian humidifiers (formerly known as GermGuardian humidifiers) use Silver Clean technology to deliver exceptionally clean, restorative moisture to your room. Embedded microscopic silver particles in each humidifier’s water tank naturally eliminate harmful mold and mildew to promote clean invisible moisture. PureGuardian humidifiers are economical and easy to maintain, since there are no evaporating pads, filters, or wicks to clean and replace. Plus, ultrasonic operation provides precise, silent operation. With some models featuring alarm clocks and digital displays, this line of stylish humidifiers will improve your indoor air quality and the comfort of your room.