<b>Compatible with blueair blue pure 211+ air purifier replacement filter</b><br>Made of high quality materials for durability<br>Granules and activated carbon filters reduce dust, pet litter,odors,tobacco smoke and other gaseous pollutants<br>It is recommended to replace the filter every 6 months to keep the machine running at peak performance.<br>The filter is environmentally friendly and can be recycled after replacement<br>Compatible with Blueair pure blue 211 +<br><br>Note:This is not a Blueair OEM product.The Blueair brand names and logos are the registered trademarks of their respective owners. Any use of the Blueair brand name or model designation for this product is made solely for purposes of demonstrating compatibility.