What is NOT the unit of measurement for water hardness?
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A.
Milligrams of calcium carbonate per litre
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B.
Parts per million
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C.
Grams per gallon
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D.
Grains per gallon
Correct Answer:
C. Grams per gallon
Explanation:
Grams per gallon is not a standard unit for measuring water hardness. Common units include milligrams per liter (mg/L) of calcium carbonate, parts per million (ppm), and grains per gallon (gpg). While grains per gallon is a widely used measurement in residential settings, grams per gallon is not used because the mineral concentrations in water are typically too small to be measured in grams.
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