Which of the following can indicate a problem in the pool water quality?

Changes in water clarity are a significant indicator of potential problems in pool water quality because they can reveal underlying issues such as the presence of contaminants, algae growth, or improper filtration. Clear water is typically a sign of well-maintained pool conditions, while cloudiness or discoloration may suggest that the water is not being treated correctly or that there are bacteria, debris, or other pollutants present. Monitoring water clarity helps pool operators assess the effectiveness of their maintenance routines and chemical treatments.

In contrast, proper chemical levels, maintained temperature, and even distribution of water are all signs of good pool management and do not signal problems with water quality. In fact, these factors contribute to optimal swimming conditions, ensuring safety and comfort for users.