YIOU R1 Air Purifier Replacement Filter - 3-in-1 Pre-Filter, True HEPA & Activated Carbon Filter for Home, Office, Bedroom - Blue (Original)

This is the best filter for the YIOU air purifier. The blue one that comes with it wasn’t all that great. This filter cost roughly $25/filter at the time of this post and it’s well worth the price.I have it outside my kitchen and where i used to setoff my smoke detector, i called it my kitchen timer, now I don't.Very quiet and does not disturb our sleep.I love this but it is too expensive!Works extremely well & I & my daughter who also has Asthma can noticeably tell a difference.My dog has the dog equivalent of COPD and this helps clean the air for him, for all of us in the house too worth every penny and dollar.After using this filter in new purifier, for first night in bedroom with 3 cats, my son’s allergy symptoms are much, much better!!! Buying a second filter to have in stock & can review again later! Price is worth it.The filters only last a month