世界卫生组织(WHO） 在2011年发布的 《Hardness in Drinking-water》报告中
提到：硬度在0-60mg/L为软水，硬度在60-120mg/L为中软水，硬度在
120-180mg/为硬水，硬度≥180mg/为高硬度水；我国测定饮水硬度是将水中
溶解的钙镁换算成碳酸钙，以每升水中碳酸钙为计量单位。
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