Two-thirds of the water on earth is groundwater. As it travels through rock and soil it picks up particles of calcium, magnesium, iron, lead and other minerals. For over 85% of the country, this means “hard water”.
“Hardness” refers to the amount of calcium and magnesium in the water and is measured in grains per gallon (gpg)(where a grain is a measurement of weight) or in parts per million (ppm) (17.1 ppm = 1 gpg). The table below illustrates the ratings of hard water based on the amount of hardness contaminants.
HARD WATER COMES FROM BOTH PRIVATE WELLS AND PUBLIC WATER SUPPLIES. In both cases water treatment for hardness removal is needed. Since the cost of softening water at a central utility is very high, water companies generally leave the responsibility for soft water to the homeowner. Some water companies may soften their water supply to some degree, but it will usually be at least moderately hard. No matter what the source, a water softening system in your home or business that achieves hardness removal at the point of entry can effectively and economically reduce the gpg levels to below 1.0.