"I've purchased 5+ different air purifiers over the years and hoped they were making a difference but could never actually tell. I got an ad for these Barnakl filters and thought I'd give it a try since they're so much cheaper than a new air purifier. This pic is after 45 days on my living room ceiling fan. HOLY COW!! I dust at least 1x per week and vacuum 1x per day (I have 2 dogs), so I thought I was living clean - but these filters show that I was apparently mistaken. I used to have allergies pretty much year-round and about 1-2 weeks after installing Barnakl, I found myself not reaching for the allergy meds and my eyes all of a sudden were less puffy. Barnakl filters were the only thing that I changed in my lifestyle!"