Air Washing layer heps capture large particles such as pollen that pass through the filter</br>Filter helps remove minerals and pollutants from the water</br>Protec Antimicrobially Treated - helps prevent the growth and migration of mold?? algae and bacteria on the filter</br></br>Product Description</br></br>Honeywell Premium Replacement Humidifier Filter With Air Washing Technology.</br><br/>http://www.amazon.com/gp/product/B005XCYQY6