Bring clean air into your home or office. The True HEPA Replacement Filter removes up to 99.97% of airborne allergens as small as 0.3 microns*. It features a built-in prefilter that traps larger particles and an activated carbon filter to reduce pet smells, household odors, and VOCs**. Performance is best when the filter is replaced every 12 months***. Compatible with the Homedics® Smart Tower Air Purifier, models AP-T200 and AP-T2503.FOOTNOTES*Removes up to 99.97% of airborne particles as small as 0.3 microns from the air that passes through the filter media.**Reduces formaldehyde and toluene in the air as shown by independent laboratory testing. Reduces common household odors such as pet, bathroom, laundry, diaper pail, cooking, and smoke as shown by independent laboratory testing.