free chlorine presentation.ppt
What is a free residual? Chlorine in ‘pure’ H 2O = HOCl + OCl-HOCl = Hypochlorous Acid OCl-= Hypochlorite Ion Free chlorine residual = HOCl / OCl-Free ‘available’ chlorine is very reactive Total Chlorine – Free = Combined Minimum system chlorine residuals: IL EPA: 0.2 free / 0.5 mg/L total IA DNR: 0.3 mg/L free / 1.5 mg/L total
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