Product review (4 stars): Visible Improvement
I have no sophistication on water quality, other than taste, smell and visuals. I replaced the filter in our Kitchen Aid fridge, the replaced filter was "way past due".  The ice showed improvement within 2-3 cycles, with cubes looking much clearer. Also, at the end of an iced beverage, there was no mineral residue in the bottom of the glass. I put "fridge filter replace" in my calendar for 9-months based upon initial estimate of our water quality and usage.