Why we have to determine the hardness of water?
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Water hardness is a measure of the amount of calcium and magnesium salts dissolved in water. There are no health hazards associated with water hardness, however, hard water causes scale, as well as the reduced lathering of soaps.
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Water hardness is important to fish culture and is a commonly reported aspect of water quality.It is a measure of the quantity of divalent ions(for this discussion,salts with two positive charges)such as calcium,m magnesium and/or iron in water... Calcium has an important role in the biological processes of fish."
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