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What is hard water?

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What is hard water?

  • Jun. 04,2018
According to the U.S. Geological Survey, more than 85 percent of the United States geography has hard water. Hard water forms when naturally occurring minerals enter water sources. Over time these minerals are absorbed by groundwater. The two most common types of minerals found in hard water are calcium and magnesium compounds. The Water Quality Association of the United States defines hard water as water containing dissolved hardness minerals above 1 GPG (grains per gallon). The most common hardness causing minerals are Calcium and Magnesium. Levels of hardness are classified as follows:
Soft Water - less than 1 GPG,
Slightly hard - 1 to 3.5 GPG
Moderately hard - 3.5 to 7 GPG
Hard - 7 to 10.5 GPG
Very Hard - 10.5 and higher GPG

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