The Honeywell Humidifier Replacement Filter removes minerals and pollutants from water. The ProTec antimicrobial treatment helps to prevent the growth and spread of mold. This Honeywell replacement filter can guard against fungus, algae and other germs escaping into the air. It does this by keeping the pollutants inside the filter. The primary feature is the unique air washing technology that harbors microbes so they cannot leave. It also has an exclusive Dry-Lift handle. This helps to ensure that your hands are kept clean and dry when removing and working with the filter.