The BEST-AIR-3BT is a bacteriostatic water treatment product that helps to inhibit the growth of bacteria, mildew, and mold from growing on your humidifier filter. Used with evaporating humidifiers, not vaporizers, this product will reduce the bacterial growth on your filter and allow your machine to produce fresher smelling air. Without treatment humidifiers can become a breeding ground of mildew, algae, and mold growth with contributes to unusual odor and potentially harmful contaminant distribution. Protecting your filters also affords increased efficiency and filter life. Order your BestAir Humidifier Bacteriostatic Water Treatment today!