When conducting water tests, why is measuring total and free chlorine important?

Measuring total and free chlorine is crucial for evaluating the chemical balance of pool water, which directly impacts swimmers' safety. Free chlorine refers to the chlorine that is available to sanitize the water, effectively killing harmful microorganisms and keeping the pool clean. Total chlorine, on the other hand, includes both the free chlorine and any combined chlorine, which is less effective at sanitizing and can lead to issues such as irritation and unpleasant odors.

By testing both types of chlorine, pool operators can ensure that there is enough free chlorine available to protect swimmers from pathogens while also managing the levels of combined chlorine to maintain a safe and pleasant swimming environment. This is integral to maintaining water quality and promoting a safe recreational experience for all pool users.