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Under actual plant conditions, even if we cannot try to keep the flow rate of water in the lime feeder constant. The water plant flow rate entering the lime feeder will keep changing in proportion to the actual plant flow rate because the doage will change in certain degree in daily operation, so the dosage of lime required in the plant will change as per the amount of water entering the plant. So the calculations must be based on the variable 'ratio' i.e. the fraction of plant flow rate entering the lime feeder. The effect of this ratio on the ANC and pH are illustrated in the MathCad file.
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