Certified Pool Operator Practice Test

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If you notice a clear greenish tint in pool water, what could be the likely problem?

  1. High pH level

  2. Presence of algae

  3. Presence of copper

  4. Low chlorine level

The correct answer is: High pH level

A clear greenish tint in pool water is a sign that there is an imbalance in the pool's pH level. This is because the water is too alkaline, which is often caused by an increase in the amount of chlorine in the pool. If the water's pH level is too high, it can cause irritation to the eyes, skin, and mucous membranes. Presence of algae (B) can also turn pool water green, but it will appear cloudy and not clear. Presence of copper (C) can result in a blue-green tint to the water. Low chlorine level (D) can cause discoloration of the water, but it will be more of a brown color rather than green.

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