Product review (1 stars): Low water flow after filter installed
Filter was properly installed, but water flow was only a trickle.  Tested the water flow without filter and it was fine.  Contacted Whirlpool customer service and they said it's a bad filter, which from other reviews is not a unique issue.  Disappointing, given the high cost of the filter.  Am hoping Amazon will still allow an exchange for a replacement and that it will work as promised.