Product review (5 stars): Does the trick for us.
I don't know if this just works with our Whirlpool fridge, but it's a lifesaver in a town where the tap water is as hard as ours. It works well and it usually lasts close to 6 months, though the flow slows down and doesn't do much as a filter if we don't change it in time. I've had no reason to look for any other product, it works just fine on our 3 year-old fridge.