Product review (4 stars): Appears to be working as advertised although I am not a chemist and cannot verify what it is taking out and leaving in.
This was easy to install and it appears to work as advertised although I am not a chemist so I cannot verify what it does and does not take out of the water but the water tastes good but I live in the Kenai Alaska and the water quality is fairly good to start with for the city water comes from a deep well and I use this at my sink in the kitchen for water they use for baking and cooking.