These are very good filters. I can tell because there is a lot less accumulating on the furniture. I would recommend buying a years worth. It gets a lo5 cheaper the more you buy.
Quick delivery great price fits perfect & have had them in place for about a week. I'll submit another review in about 30 days when I change it out. Initially they're great!
Trying these filters for first time. Household air seems very fresh. AmNoticing a bit less nose-blowing. Every allergy prone person shouldTry these filters.