Combat dry, stuffy indoor air with the Holmes Cool Mist Humidifier. Improve the air quality in your home and protect your family from the effects of damaging, dry air, especially during the harsh winter months. This humidifier uses water filtration to help remove impurities in the water and includes an aromatherapy tablet cage.This filter is treated with an antimicrobial agent to inhibit the growth of mold, mildew and odor-causing bacteria on the surface of the filter only and ARM & HAMMER *(6) to help eliminate odors . Antimicrobial action limited to product surface. 1-year limited warranty