Certified Facility Manager (CFM) Practice Exam

In swimming pools, what is a potential consequence of unstable pH levels?

1. Water discoloration

2. Corrosion of pool equipment

3. Reduced chlorine efficiency

4. All of the above

The correct answer is: All of the above

The presence of unstable pH levels in swimming pools can lead to multiple adverse effects, which is why the correct answer encompasses all the options provided. When the pH level fluctuates outside the ideal range (typically between 7.2 and 7.8), it can lead to water discoloration. This is often a result of chemical reactions in the water, including the precipitation of minerals or the interaction with pool surfaces. Furthermore, unstable pH levels can cause corrosion of pool equipment. Acidic water (low pH) can erode metal components and fixtures, decreasing their lifespan and increasing maintenance costs. Conversely, high pH levels can lead to scaling, which can damage filtration systems and make it difficult for chemicals to work properly. Reduced chlorine efficiency is another significant consequence of unstable pH; when pH levels are not balanced, chlorine becomes less effective as a sanitizer. This can lead to inadequate disinfection of the pool, contributing to unsanitary conditions and potential health hazards for swimmers. Therefore, the interconnectedness of these issues highlights why unstable pH can have a comprehensive negative impact on pool water quality, equipment integrity, and overall safety, making "all of the above" the correct response.