And Two, it’s more sensitive to filter lifetime than A few other purifiers: We’ve measured relatively sizeable drop-offs when testing yr-aged filters. Blueair recommends changing the filter “each 6 months or so,” and it’s best to stick to that routine. กิจกรรมเพื่อสาธารณะประโยชน์ของบริษัท Two Coway filters that we bought in February 2021 Successfully Submitted (Awaiting Approval)