Mineral water forms underground in an unpolluted state and gets packaged at the source. Because it flows through layers of rock, it naturally contains sulfur compounds and minerals such as calcium, potassium, magnesium, sodium, manganese, zinc, and iron. These substances impart a distinctive flavor that varies by location (due to the differing concentrations in the ground), making mineral water one of the best options for taste and refreshment. Federal regulations forbid water bottlers from adding minerals to mineral water. The Food and Drug Administration mandates that mineral water must contain a minimum of 250 parts per million of total dissolved solids, but the ratio and amount of these nutrients vary among brands. Mineral water may be minimally treated to remove toxic substances or add carbonation before bottling. Some mineral water comes naturally carbonated.
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