Scaling Ion COC (Calcium)

Cycles calculated from a scaling-risk ion (calcium). If COC_tracer is greater than COC_scaling, calcium is depositing as scale; if less, scale is dissolving. The divergence quantifies the loss.

$${\text{COC}}_{\text{scaling}}=\frac{[{\text{Ca}}^{2+}{]}_{\text{tower}}}{[{\text{Ca}}^{2+}{]}_{\text{makeup}}}$$

Variables

Symbol	Meaning	Unit
$[Ca2+{]}_{t}ower$	Calcium concentration in tower water	ppm
$[Ca2+{]}_{m}akeup$	Calcium concentration in makeup water	ppm

Worked example

If chloride COC is 5.0 but calcium COC is only 3.8, roughly 24 percent of incoming calcium is precipitating as scale (1 - 3.8/5.0 = 0.24).

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Part of The Blueprint of Water