Product review (3 stars): Defective product
Unfortunately, our Whirlpool model requires the use of filters or does not work.  Charges $40 apiece!!...with that said, I ordered this dual pack, replaced our filter, immediately had water leaking.  Tried to trouble shoot.  Had a repairman out to look, said the rubber "O" rings were defective. Put second new one in, no leaks....yet. But out $89.95 for house visit.  We will not be buying Whirlpool products that require a filter anymore.  Gave half the stars only because half of the purchase worked.