Permanently hard water
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Hard water is water that is difficult to soften even when boiled. It is water that contains a large amount of sulfates (non-bicarbonates) such as calcium and magnesium. (New Terms of Use (1921)) Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
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〘名〙 煮沸しても軟化しにくい硬水。カルシウム、マグネシウムなどの硫酸塩（非炭酸水素塩）を多量に含む水をいう。〔新しき用語の泉（1921）〕
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