What does pH measure in pool water?

The pH value of pool water measures its acidity or alkalinity, which is crucial for maintaining a safe and healthy swimming environment. The pH scale ranges from 0 to 14, with a value of 7 considered neutral. Values below 7 indicate acidic conditions, while values above 7 indicate basic (alkaline) conditions.

Keeping the pH within the recommended range of 7.2 to 7.8 is essential because it influences several key factors in pool maintenance. For example, imbalanced pH levels can affect the effectiveness of chlorine as a sanitizer, potentially leading to insufficient disinfection or causing discomfort to swimmers. Additionally, pH impacts the wear and tear on pool equipment and surfaces, as well as the comfort of swimmers, including eye irritation and skin issues.

Understanding pH is fundamental for pool operators to ensure water quality and safety, making option C the correct answer regarding what pH measures in pool water.