The Particle Replacement filter for the Blueair Blue Pure 211+ is top of the line. This air purification filter removes 99% of airborne particulates including dust, pollen, mold spores, dander, viruses, and bacteria as well as smoke and chemical odors. This advanced filter removes pollutants down to 0.1 microns and has a high CADR (clean air delivery rate). With just a click-and-change, the filter is easily replaced. No need to run to Home Depot Lowes or Bed Bath and Beyond, order online today and save money on your Blue air purifier filter change with Atomic Compatible Blue air purifier filter change.