Mineral water is water containing minerals or other dissolved substances that alter its taste or give it therapeutic value. Salts, sulfur compounds, and gases are among the substances that can be dissolved in the water. Mineral water can often be effervescent. Mineral water can be prepared or can occur naturally. In many places, mineral water is often colloquially used to mean carbonated water, which is usually carbonated mineral water, as opposed to tap water.
Traditionally mineral waters would be used or consumed at their source, often referred to as taking the waters or taking the cure, and such sites were referred to as spas, baths or wells. Spa would be used when the water was consumed and bathed in, bath when the water was not generally consumed, and well when the water was not generally bathed in.
Water containing not less than 250 ppm total dissolved solids that originates from a geologically and physically protected underground water source. Mineral water is characterized by constant levels and relative proportions of minerals and trace elements at the source. No minerals may be added to mineral water.
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