Product review (1 stars): Intentionally misleading
When I purchased these filters, the description said NSF 52 certified.  They are not, only NSF 42, which is clearly marked on the box.
Now, the description has that removed but still has the wrong information in the Q&A.  Further, the manufacturer has popped up with other new product listings on amazon with the erroneous claims, so my conclusion is they are misleading on purpose.
Will not purchase this brand again.