Compatible Models: Our 211+ Filter Replacement is perfect for the Blue Pure 211+ and 211+ Auto Air Purifier. Please check your Air Purifier model!It works just as well as the original. Premium Filtration: The 211+ Replacement Filter works with a high-efficiency 2-stage filtration system. The H13 True HEPA filter can catch 99.99% of airborne particles as small as 0.1 microns, and the carbon filter helps to get rid of smells, smoke, VOCs and more. High-Quality Filter：The 211+ True HEPA Filter Replacement is made of a high-quality non-woven fabric and is constructed with a premium HEPA 13 filter. We use technology that uses less energy and is less dense, and that is more efficient and less pressure-sensitive, to make sure that it filters as well as possible. Easy To Install: The 211+ HEPA Filter Replacement is easy to install, you don't need any tools. Replace every 6-8 months or when you use it up, depending on how often you use it and what the environment is like. Cost Effective Filter：Package contains 2 Pack 211+ Air Filter, The 211+ filter is a great option to your healthy breathing. If you have any problems, please contact us by email. 2 Pack 211+ Filter Replacement Compatible with Blue Pure 211+ and 211+ Auto Air Purifier, 2-Stage Filtration System of H13 True HEPA Filter and Activated Carbon Filter