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      Hard water is used as cooling water for industrial production, which will cause the heat exchanger to form scale, which will not only hinder the water flow channel, but also greatly reduce the heat exchange effect, affect the smooth progress of production, and even be forced to stop production. After the scale, there will also be corrosion under the scale, which will cause the heat exchanger to perforate and damage, not only material leakage, but also increase equipment investment costs and waste steel. Hard water is used for washing, and it often affects the quality of the product. For example, textile printing and dyeing will cause spots on the fabric, which not only affects the appearance, but also affects the strength. Hard water is used as boiler water. After being heated in China, it is evaporated and concentrated by Guoheng, so that the heating surface of the boiler is scaled, and the thermal conductivity of the scale is extremely poor. The thermal conductivity of scale is only one percent of that of steel. After scaling in the boiler, if the boiler water temperature is still the same as without scale, it is necessary to increase the wall temperature of the heating surface, which will cause a serious explosion accident.