Believe the 1 star reviews. I finally opened my box (so far I haven't had to change any filters). The box was opened and sealed but I thought everything was fine (my fault). Inside, there were no Nordic Pure markings on the filters at all; I have bought them several times in different sizes and ALL had the markings on them. Instead they wore "Prime 11" - so MERV 11?! β when I paid for the 12th. Stay away, this is cheating.
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