Product review (5 stars): It's a water filter...
Amazon, it's a water filter, it fits and it works, what do you want me to say?  LOL.

The water that comes out of the fridge is noticeably tastier than straight tap water.  I guess that means it's working.  Not sure about iron heavy water, though.  I'd like to see someone test it at a friend's house.  Their water tastes like I'm bleeding somewhere in my mouth.  That's iron heavy.

Edit:
Oh, by the way, I have a Kenmore Elite branded, LG manufactured fridge.