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How do I convert a ppm water hardness number to a gpg to set the water softener?

My water softener asks for a gpg hardness number. My water test results give me a ppm hardness figure. How do I convert the ppm to gpg?

Building Supplies
1 Answer from this member:
by LYLE W. Earned 10,724 community points in Building Supplies
October 13th, 2008
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