What is the hardness in grains per gallon (gpg)?

The hardness is 8 to 10 grains per gallon.

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1. There is red water coming out of my faucet. How do I get rid of it?
2. While doing laundry, red water has stained my white clothes. What do I do?
3. What is the hardness in grains per gallon (gpg)?
4. I have learned that I am on a boil advisory. What does this mean?