Certified Pool Operator Practice Test

The acceptable pH reading range for pool and spa water is between 7.2 to 7.8. This pH level is important because it helps to ensure effective sanitation, prevents equipment corrosion, and promotes swimmer comfort. A pH level that falls within this range minimizes the risk of eye irritation for bathers and allows chlorine and other sanitizers to work effectively. Maintaining pH levels outside of this range can lead to various water quality issues. For instance, a pH level that is too low can cause corrosion of pool equipment and irritation to the skin and eyes, while a high pH can result in decreased effectiveness of chlorine and potential scaling on pool surfaces. The indicated pH range of 6.8 to 7.4 is not suitable as it may not provide the necessary balance for chemistry and comfort, and a range of 7.0 to 7.6 could similarly lead to issues with managing sanitization efficacy. Lastly, a range of 7.4 to 8.0 exceeds the preferred upper limit of pH, which can create challenges in keeping the water properly sanitized.