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Hardness of Zhoushan tap water
The hardness of Zhoushan tap water is about 8. Water hardness, also known as groundwater hardness, refers to the content of Ca2+ and Mg2+ ions in water. That is, the content of calcium carbonate in water can form water alkali when boiling. The national standard stipulates that the hardness of tap water should not exceed 450 mg/L, and the hardness of water has a great influence on domestic and industrial water use. Hard-boiled food is not easy to cook, and there are few soap bubbles when washing.
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