Which aspect of pool maintenance helps prevent the growth of harmful microorganisms?

Sanitation processes are crucial in pool maintenance as they directly target the elimination of harmful microorganisms that can pose health risks to swimmers. This includes the use of chemicals like chlorine or bromine, which disinfect the water by killing bacteria, viruses, and algae. Regular sanitation routines ensure that the pool remains free from pathogens and maintains safe water quality for users.

While other options like water temperature control can influence the overall environment of the pool, they do not specifically target or reduce the presence of harmful microorganisms. Filtration cycles are important for removing debris and particles from the water, contributing to clarity and some aspect of microorganism control but are not sufficient on their own for sanitation. Water depth management affects safety and usability but does not play a direct role in preventing microbial growth. Thus, sanitation processes stand out as the most effective and essential measure for maintaining a healthy swimming environment.