Certified Pool Operator Test 2025 – 400 Free Practice Questions to Pass the Exam

If the total alkalinity in a pool is too low, it can lead to the formation of algae. This is because alkalinity helps to maintain the pH level in the water, and when it is too low, the pH can become too acidic. This acidic environment is ideal for algae growth. Alternatively, if total alkalinity is too high, it can cause the pH to become too basic, which can also promote algae growth.

The other options are incorrect because

- Choice B: Corrosion of pool surfaces is more likely to occur if the total alkalinity is too high, as the pH becomes too basic and can damage the surfaces.

- Choice C: Increased water hardness is not directly linked to low alkalinity. Hardness refers to the amount of dissolved minerals in the water.

- Choice D: Stabilization of pH is not a likely outcome of low alkalinity, as mentioned before, low alkalinity can lead to fluctuating pH levels rather than stability.