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软水：（Soft Water）不含或含较少可溶性钙、镁化合物的水。
含钙、镁等矿物质很低或几乎不含这些离子的水。通常用硬度表示，硬度1度相当于每升水中含10mg碳酸钙。低于8度的水称为软水，高于17度的为硬水，8～17 为中度硬水。碳酸氢钙或碳酸氢镁引起的为暂时硬度，水加热煮沸时碳酸氢钙、碳酸氢镁即分解为不溶于水的碳酸盐，水的硬度降低，即软化。硫酸盐、氯化盐引起的硬度是永久硬度，加热无法软化。长期饮用软水可使人体摄入的矿物元素减少。
Contain calcic, magnesium to wait mineral very low or the water that contains these ion scarcely. Express with hardness normally, hardness is equivalent to every 1 degree 10mg calcium carbonate is contained in premium. Call soft water under 8 degrees water, prep above 17 degrees for hard water, 8 ～ 17 hard water is spent in be. Bicarbonate calcium or bicarbonate magnesium cause for temporary hardness, water heats calcic, bicarbonate magnesium decomposes the bicarbonate when boil namely for not dissolve the carbonate at water, the hardness of water is reduced, namely bate. The hardness that salt of sulfate, chloridize causes is permanent hardness, heat cannot bate. The mineral element that long-term and drinkable soft water can make human body is absorbed decreases.
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