I emailed wix about one of their filters, and they sent me a pdf report from the Filter Manufacturer Assc. regarding micron rating and filter testing and information regarding manufactures claims and why it is hard to compare filters by these ratings. Anyone want to see it? or is it a waste of time? let me know and I will print and scan (unless someone knows tho convert a pdf to jpeg because I don't know how I would post a pdf up her for people to view.