Gary Slusser wrote:

Water is either hard or soft. In residential that means 0 gpg is soft
or 1 or more gpg is hard. The goal is consistent 0 gpg soft water
after the softener. A softener allowing more than 1 gpg through it is
not working right.

Is "gpg" grains per gallon? If it is how do I convert gpg into
parts per million?
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I don't understand why they make gourmet cat foods. I have
known many cats in my life and none of them were gourmets.
They were all gourmands!