They have MERV 12 filters of various thicknesses and sizes fairly cheap, with low pressure drops, but I never heard of them until recently. I can't find any opinions or reviews about them using Google (except one, someone complaining about their order getting crushed during shipping). Has anyone used them? If possible I'd like to find out about defects, weaknesses or concerns before I buy a case...
http://www.nordicpure.com/

Thanks!