[PREMIUM FILTRATION] 2 Pack 211+ True Filter Replacement Filters remove 99.97% of particles as small as 0.3 microns, helping to remove particles such as pet dander, pollen, dust and smoke. [COMPATIBLE] Premium PARTICLE and ACTIVATED CARBON Filter Fits the Blue Pure 211+ Air Purifier. PLEASE CHECK YOUR AIR PURIFIER MODEL! [EASY TO INSTALL] The 211 True Filter Replacement is easy to install, no tools required. Replace every 6-8 months or according to use and environment. [PREMIUM QUALITY BUT AFFORDABLE PRICE] We provide high quality, durable and long-lasting replacements, allowing the filter to last longer. To improve the performance of the air purifier, please replace the carbon filter every 6~8 months. [Pure Air Filter Replacement Economical] Reduce your electricity bill by replacing your old, clogged filters that cause your air purifier to work harder than necessary. 211+ Replacement Filter Compatible with Blue Pure 211+ Air Cleaner Purifier, Particle and Activated Carbon Replacement Filter