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A 20 MGD facility treats water with [Mg+2] = 70 mg/L as CaCO3. What fraction of the flow should be treated, if the treated fraction

A 20 MGD facility treats water with [Mg+2] = 70 mg/L as CaCO3. What fraction of the flow should be treated, if the treated fraction will be at the practical limit of 10 mg/L as CaCO3, and the design objective is 40 mg/L as CaCO3?

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