Product review (5 stars): It's a charcoal filter. Not much to say. ...
It's a charcoal filter.  Not much to say.  It was a pain to remove all the items from my Whirlpool Gold unit to get to it, but from there, replacement is straight forward.  Can't believe how "worked" the old filter was...  Not sure these are true OEM Whirlpool, as they did not exactly match what came out of my new unit, however, they do the trick.  Will buy again.