Which method is used to control the concentration of oxidizers in pool water?

The correct choice is related to the method used to monitor and control the concentration of oxidizers in pool water, which is essential for maintaining appropriate water quality and swimmer safety. Oxidation-reduction potential (ORP) measurements directly assess the ability of the pool water to oxidize contaminants.

ORP indicates the overall oxidizing or reducing power of the water, which correlates well with disinfection levels provided by oxidizers such as chlorine or bromine. By regularly measuring ORP, operators can adjust the addition of chemical sanitizers to ensure that the levels are effective at controlling harmful bacteria and organics present in pool water.

This method provides not only a quantitative measure but also a real-time response that allows for quick adjustments to the chemical dosages based on actual water conditions, ensuring that the water remains safe for swimmers. Other options, while important aspects of overall pool maintenance, do not specifically or effectively control oxidizer concentrations in the same way.