If the pool water is cloudy and the main drain is not visible, what is the first action the operator should take?

When the pool water is cloudy and the main drain is not visible, closing the pool to swimming is an essential first step to ensure safety. Visibility issues can lead to dangerous situations, as swimmers could have difficulty locating the drain or getting to safety. By closing the pool, the operator effectively prevents any potential accidents from occurring until the water quality can be assessed and improved.

While actions like cleaning the filter, super chlorinating the pool, or checking and adjusting the pH are all important maintenance steps that might help in resolving the cloudiness, they do not directly address the immediate safety concern of swimmers being in potentially hazardous water. Therefore, closing the pool protects patrons while the operator takes further actions to restore water clarity and safety.