Chlorine Demand and Dose for a Target Residual
The chlorine consumed by the water (applied minus the measured residual) and the dose to hold a target residual (demand + target). A high or rising demand points to ammonia or organics - check the breakpoint curve. Standard Methods 4500-Cl / AWWA M14; the state primacy agency sets the compliance residual and method.
Formula and source
demand = applied - measured_residual; dose_for_target = demand + target_residual. A high demand (flagged above 4 mg/L) suggests ammonia / organics - check the breakpoint curve.
Standard Methods 4500-Cl / AWWA M14 (by name); applied-minus-residual mass balance, no edition cycle.
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