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Using the following figure, what is the chlorine dose required to attain a combined residual of 0.5 mg/L and a free residual of 0.5 mg/L?

Using the following figure, what is the chlorine dose required to attain a combined residual of 0.5 mg/L and a free residual of 0.5 mg/L? What is the combined residual present when a free residual of 0.5 mg/L exists?

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Chlorine demand curve Chlorine dose, mg/L

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