What type of maintenance is required for preventing algae growth?

Regularly testing water chemistry is crucial for preventing algae growth because it allows pool operators to monitor and adjust the levels of key chemical components such as chlorine, pH, and alkalinity. Algae thrives in conditions where chlorine levels are insufficient, or pH levels are not balanced. By consistently checking the water chemistry, operators can ensure that the sanitizer levels are adequate to inhibit algae proliferation, maintain proper pH to enhance sanitizer effectiveness, and identify any other imbalances that could contribute to an unhealthy pool environment.

The other options, while they may have some relevance in pool maintenance, do not directly address the prevention strategy as effectively. Running the filter continuously is important for circulation and clarity but does not replace the need for adequate water chemistry management. Using algae treatments only when visible may be reactive rather than proactive, allowing algae to establish itself before treatment is applied. Reducing pool usage could mitigate the introduction of organic matter and contaminants but does not fundamentally address the water balance and sanitizer levels required to prevent algae growth effectively.