HEPA and activated carbon filter. Removes allergens such as pollen, dust, pet dander, etc. Eliminates up to 99.9% of bacteria and viruses. Effectively removes particles as small as 0.003 μm. Absorbs and traps formaldehyde, TVOCs, and odors. Effortless filter maintenance thanks to the all-in-one design. Three filters in one for convenience and superior performance. The cylindrical 3-in-1 filter contains three filter layers to ensure your device delivers consistently high performance. The optimal combination of our activated carbon, HEPA, and pre-filter removes pollutants, viruses, allergens, and bacteria from the air. We recommend replacing all three filters at the same time for cleaner air to breathe.