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Water containing little or no dissolved salts of calcium or magnesium, especially water containing less than about 85 parts per million of calcium carbonate.
Either pure water or water containing salts that do not react with soap to form insoluble soap scum. Before the use of water-softening chemicals, the primary source of soft water was from rain, and rainwater was often caught and saved in washtubs or barrels.
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|Noun||1.||soft water - water that is not hard (does not contain mineral salts that interfere with the formation of lather with soap)|
H2O, water - binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent
hard water - water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap