Arm & Hammer Hoover NanoLite Cyclonic HEPA Filter: * HEPA filter traps particles 75 times smaller than a human hair, including 99.7 percent of dust mite debris, animal dander, molds and pollen * Baking soda particles neutralize odors * Replace every 90 to 120 days for optimum performance * For use in the Hoover NanoLite Cyclonic vacuum