Item Type: Air Purifier Filter Material: High Efficiency Particulate Air, cotton and activated carbon Package List 2 x Air Purifier Filter 2 x Activated Carbon Sponge Filter To maintain the excellent performance of your air purifier, we recommend changing the filter every 6 months or so. 1Excellent Filtering Effect: This filter element can effectively capture up to 99.97% of the indoor air with harmful particles as small as 0.3 microns, such as dust, pollen, etc. 2Strong Adsorption Capacity: This filter element has developed pore structure, large specific surface area, strong adsorption capacity and high strength. 3Perfect Replacement: This filter is suitable for Blueair Sense and is a very good replacement filter, the clean air delivery rate after replacement is comparable to the original. 4Remove Odor: This filter can easily remove fumes, chemicals, volatile organic compounds and other odors, purify your air quality and keep your airways healthy. 5Easy to Use: All you have to do is remove the product and replace the old filter, which is quick and easy to install in seconds.