In the U.S. water hardness is most often reported as milligrams per liter (mg/L), or parts per million (ppm) as calcium carbonate (CaCO3). Hardness may also be reported as "degrees hardness" (dH) or as grains-per-gallon (gpg).
Hardness as Calcium carbonate
There are many solutions when it comes to hard water. These solutions may be temporary and only soften a small amount of water at one time (Water pitcher filters and boiling water). There are also whole house filtration systems and water softeners.
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To determine the appropriate water softener size for your home, multiply the number of people in your home by the gallons of water they use each day. (80 gallons per person is the average.) Multiply that number by the grains of hardness in your water to figure out how many grains need to be removed each day. Most four-person households use a 33,000-grain unit.
Hard Water Basics