Cycles of Concentration (chloride)

Measures cycles of concentration using chloride, a conservative non-reacting ion, as the tracer.

$$\text{COC}=\frac{[{\text{Cl}}^{-}{]}_{\text{Tower}}}{[{\text{Cl}}^{-}{]}_{\text{Makeup}}}$$

Variables

Symbol	Meaning	Unit
$[{\text{Cl}}^{-}{]}_{\text{Tower}}$	Chloride concentration in the tower water	mg/L
$[{\text{Cl}}^{-}{]}_{\text{Makeup}}$	Chloride concentration in the makeup water	mg/L

Worked example

At two cycles every ion is at twice its makeup level, at four cycles four times, at six cycles six times.

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Part of The Blueprint of Water