Product review (1 stars): Not for wells...
I compared the filtration label from the OEM Kenmore filter to this one, and was very surprised that this one doesn't filter nearly as much as the other one.  This one passes two standards, NSF/ASNI 42 and 372. I looked it up, and basically, that means that it filters only chlorine (and that it CONTAINS no lead).  The OEM Kenmore filter complies with standard 53, which filters against lead, mercury, lindane, etc, etc.  You can see it on the label of the attached picture.

For me, this was a complete waste of money.  We have a well, and have no chlorine in our water.  The water tastes a bit different from the OEM one too.  Unfortunately, I'll have to toss these and buy the OEM one.