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| Food & Agrofood industry-Remineralisation of water for human consumption |
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Calcium chloride is used in water treatment as a source of soluble calcium where its addition is needed but a substantial increase in pH or alkalinity is undesirable. It can also be used to increase the calcium ion concentration in waters with high alkalinity and high sodium ion content or in waters with acceptable magnesium ion concentrations and high alkalinities. These waters can then be softened by the addition of lime, therefore reducing the alkalinity to acceptable levels. In classic municipal lime softening, this practice would be counterproductive, but for the previously mentioned uses, it is essential. Calcium chloride is less frequently used as a coagulant aid in certain waters.
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