Which of the following substances is commonly used for pool disinfection?

Chlorine is the substance commonly used for pool disinfection due to its effective antibacterial and antiviral properties. It works by releasing hypochlorous acid in water, which kills harmful microorganisms, including bacteria, viruses, and other pathogens that can thrive in pool environments. This makes chlorine essential for maintaining safe and sanitary swimming conditions.

In addition to its disinfection capabilities, chlorine also plays a role in controlling algae growth, helping to keep the pool water clear and inviting. Regular monitoring and maintaining proper chlorine levels in the pool are vital for ensuring the effectiveness of the disinfection process, which contributes to the overall health and safety of swimmers.

While sodium bicarbonate and calcium carbonate are often used to buffer and stabilize pH levels in pool water, they do not have disinfectant properties. Algaecides are specifically designed to combat algae but are typically used in conjunction with chlorine rather than as a primary disinfectant.