How often should pool water be tested for pH and chlorine levels?

Testing pool water for pH and chlorine levels is essential for maintaining safe and healthy swimming conditions, particularly in facilities with high usage. High usage environments, such as community pools or water parks, experience more contaminants and changes in water chemistry due to the increased number of bathers. Therefore, testing these levels at least once a day ensures that the water remains balanced and safe for swimmers.

Chlorine is crucial for disinfecting the water and eliminating harmful pathogens, while pH levels affect chlorine's effectiveness as well as the comfort of swimmers. Regular daily testing allows pool operators to make timely adjustments to chemical levels, ensuring that the water quality remains within the recommended guidelines. Maintaining this vigilance is especially important in crowded venues where the pool's water quality can change rapidly.

While the other options suggest less frequent testing, they do not adequately account for the fluctuations in water chemistry that can occur in high-traffic facilities. Thus, testing at least once a day aligns with best practices for water safety management in such scenarios.