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Hard water is water that contains high amounts of Ca2+ and/or Mg2+. Sometimes Mn2+ and other multivalent cations are included in the measure of hardness. Note water may contains minerals and yet not be considered hard, by this definition. Hard water occurs naturally under condition where water percolates through calcium carbonates or magnesium carbonates, such as chalk or limestone.
Githiari answered the question on September 25, 2017 at 08:44
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