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Poor Reagent UtilizationCauseMalfunctioning pH MonitorAnalyticalIndicationPoor agreement during pHcalibration checkCorrective ActionMake repairs to pH monitorsystemSulfite BlindingPoor reagent utilizationalong with elevated levelsof soluble sulfiteAluminum Fluoride Blinding Poor reagent utilizationalong with elevated levelsof aluminum and fluorideVerify operation of oxidationair system. Correct asrequiredImprove particulate removalupstream of scrubberPoor Limestone Quality orOff-Spec Grind SizeSieve analysis, compositionanalysisModify grind circuit and/orobtain better limestone