What does the pool closure indicator apply to in terms of water quality?

The pool closure indicator primarily applies to the presence of fecal material. This is a critical water quality concern because fecal contamination can introduce pathogens, such as bacteria and viruses, that pose serious health risks to swimmers. When fecal matter is detected in the pool water, immediate action is required to close the pool, ensuring that the health and safety of patrons are preserved.

Swimming pool operators are trained to monitor for signs of contamination and follow specific protocols for disinfection and cleaning to eliminate any harmful organisms. This response is essential for maintaining a safe swimming environment and preventing waterborne diseases. The other factors, while important in maintaining overall water quality, do not trigger the same urgent closure protocols that are in place for fecal contamination.