🌿211+ Replacement Filter Compatible with Blueair Blue Pure 211+, Activated Carbon Filter<br><br> 🌿【Compatible Model 】PARTICLE & ACTIVATED CARBON filter Compatible with Blueair Blue Pure 211+. <br><br> 🌿【Friendly Reminds】We suggest you replace the 211+ replacement filter every 6~8 monthes depending on conditions of your surroundings. <br><br>