The Blue Pure 211+ Particle and Activated Carbon Replacement Filter protects\\\\nagainst both gaseous and particulate contaminates. An activated carbon mesh\\\\nlayer eliminates harmful gaseous pollutants such as volatile organic compounds\\\\n(VOCs), tobacco smoke, and other odors. In addition, advanced polypropylene\\\\nfilter media removes particle pollutants down to 0.1 micron in size from your\\\\nindoor air, such as pollen, dust, and pet dander. Using a 360-degree air\\\\nintake and up to 4 times the filter surface area than competing replacement\\\\nfilters, the Blue Pure 211+ Particle and Activated Carbon Filter lasts longer,\\\\non average from 6 months to a year. Subscribe & save up to 10% on auto-\\\\ndelivered filters when replacement is needed; We recommend replacing your\\\\nfilter about every 6 months depending on usage. NO COMPARISON – 4X FILTER\\\\nSURFACE AREA & 360 AIR INTAKE: Blueair models with HEPASilent's mechanical and\\\\nelectrostatic filtration produced higher CADR, lower noise, and had lower\\\\nenergy consumption vs. the same models with only mechanical filtration (H13\\\\nfilter). Tested on E.coli, Influenza A (H1N1), A.niger with a minimum\\\\nreduction rate of 99.9 in 60min.