Gary Slusser
That's all folks!
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And notice that in all those cases the ppm is converted to GPG, because all softeners are set up and sized based on GPG. That is a fact.I disagree. In support of my position I point to the numerous posts on this website where hardness is expressed in PPM--these are posted by homeowners and, I am assuming, are for residential purposes.
Grains per gallon is simply a scale for expressing hardness, as is ppm. There is a very simple equivalency between the two scales. 17.1 ppm of hardness equals 1 grain per gallon per hardness.
Why we see ppm or mg/l in so many posts is due to labs and water companies stating hardness as ppm or mg/l. We also see numerous water companies and some labs saying that water with up to 150-180 ppm of hardness is soft; which it is not soft.