Atomic Compatible Replacement Triple Stage air filter works with the Levoit LV-H132 Small Room Air Purifier. This filter does triple the work to clear the air in your small room. This filter employs a three-stage filtration including Fine Preliminary, True HEPA and Activated Carbon filters to remove 99.97% of dust, allergens, bacteria and odors Easy, Simply rotate the filter cover off, remove any existing filters, clean out any particles inside, then place the new filter in (after removing it from its packaging). Make sure the tabs are facing outward. Secure the lid until the arrows on either side align Replace the filter every 6 months to optimize its performance.