Help ensure the breathing environment of your home or office space is clean with the help of this carbon filter. The media is designed to trap white dust which is a byproduct of hard water while the included material helps reduce and growth. Humidifier models (sold separately). Carbon media helps capture and remove impurities from your water for cleaner water vapor. Reduces the presence of white dust which is a byproduct of minerals in hard water. Also features an material to reduce the chance of and growth.