Pool Water Chemistry
What Is Free Chlorine?
Free chlorine is the chlorine residual measured as available for disinfection rather than combined chlorine.
Understanding the Concept
A chlorine test distinguishes free chlorine from total chlorine. Their difference is the calculated combined chlorine result.
Common Misunderstanding
Cyanuric acid changes chlorine chemistry and activity. A free chlorine reading alone does not establish that water is safe.
Related terms
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