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I want to know the solubility of "total dissolved salts" or mainly Calcium Chloride and Magnesium Chloride causing hardness of water.

Is this data published anywhere at different temperatures?

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Google is your friend. Using "Calcium chloride solubility", you find plenty of references where this solubility is given at different temperatures. Expressed in grams $\ce{CaCl2}$ in $100$ mL water, it is $59.5$ à $0°$C, $64.7$ at $10°$C, $100$ at $20°$C, $128$ at $30°$C, $137$ at $50°$C, $147$ at $70°$C, and $159$ at $90°$C. Do the same with Magnesium chloride.

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