Which of the following is a common method for sanitizing pool water?

Using chlorine as a method for sanitizing pool water is widely accepted and practiced due to its effectiveness in destroying harmful bacteria, viruses, and other pathogens that can pose health risks to swimmers. Chlorine works through a process known as oxidation, where it reacts with contaminants in the water, ensuring that the pool remains clean and safe.

In addition to killing pathogens, chlorine helps to control algae growth, contributing to clearer and more hygienic water. It is also available in various forms, such as liquid chlorine, granular chlorine, or chlorine tablets, providing flexibility in how it can be applied to pool maintenance.

While other substances like vinegar and baking soda serve specific purposes in pool care, such as balancing acidity or alkalinity, they do not serve as primary sanitizers. Additionally, algaecide is primarily used to prevent or treat algae infestations rather than serving as a general sanitizer for all types of waterborne pathogens. Therefore, chlorine stands out as the most effective and common method for maintaining sanitized pool water.