The most authoritative answer in 2024
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Ava Hernandez——Studied at Harvard University, Lives in Cambridge, MA
It takes 17.1 PPM to equal 1 GPG. If measured in parts per million or milligrams per liter take total
hardness and divide it by 17.1 to
get hardness in
grains per gallon. For example if your
water test shows 250mg/l
hardness you actually have 14.62
grains per gallon.
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