This 2 in 1 Humidifier & Purifier washes and humidifies a room's air without evaporator mats. Special humidifier discs turn through the water removing impurities from the air naturally, which is a great relief to allergy sufferers. Therefore it is called an Air Washer. The discs, which never need replacing, have a great adhesion for water to guarantee high humidity output. The Air Washer is equipped with the Hydro Cell that provides constant freshness in in your humidifier.