What is my water hardness in grains/gallon?
In most cases, water quality parameters are reported in parts per million (ppm) or milligrams per liter (mg/L). To convert hardness in ppm (or mg/L) to grains per gallon (gpg), simply divide by 17.1. For example, water hardness of 100 ppm equals 100/17.1 or 5.85 gpg.

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4. What is my water hardness in grains/gallon?