Certified Pool Operator Practice Test

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Chlorine added after the breakpoint is reached will exist as what?

bound chlorine
combined chlorine
free chlorine
total chlorine

The correct answer is: bound chlorine

Chlorine added after the breakpoint is reached will exist as bound chlorine. This is because the breakpoint is the point at which the chlorine has fully reacted with any available contaminants, leaving behind only the bound form of chlorine. Combined chlorine, which is the chlorine that has reacted with contaminants but is still able to disinfect, is typically found before the breakpoint. Free chlorine, which is the most effective form of chlorine for disinfection, is typically found before the breakpoint as well. Total chlorine refers to the sum of all forms of chlorine, including bound, combined, and free chlorine. Therefore, A is the correct answer as it reflects the state of chlorine after the breakpoint has been reached.