What can be used to sanitize pool water effectively?

Chlorine is widely recognized as an effective sanitizer for pool water due to its ability to kill bacteria, viruses, and other pathogens that can be harmful to swimmers. When added to pool water, chlorine reacts chemically to form hypochlorous acid, which is the primary agent responsible for disinfection. It helps maintain water quality, clarity, and safety by continuously working to eliminate contaminants that can pose health risks.

In contrast, substances like vinegar, while having some antibacterial properties, are not effective sanitizers for pool water on the scale and in the manner needed to keep a swimming pool safe and hygienic. Pool paint is not a sanitizing agent; its purpose is to provide a protective and aesthetic coating to the surfaces of the pool. Similarly, flower fertilizer does not serve any sanitizing function in the context of pool water; in fact, it can introduce unwanted chemicals and nutrients that can disrupt the pool's water balance and promote algae growth.