What is the primary disinfectant used in most commercial pools?

Chlorine is the primary disinfectant used in most commercial pools due to its effectiveness as a broad-spectrum sanitizer that kills bacteria, viruses, and other pathogens that may be present in pool water. Chlorine works by forming hypochlorous acid and hypochlorite ions when dissolved in water, which actively disinfect the water by damaging the cellular components of microorganisms.

Another significant factor contributing to chlorine's popularity is its cost-effectiveness and ease of use. Chlorine can be easily added to water in various forms, including gas, liquid, or solid (tablets or granules), making it accessible for pool operators. Additionally, chlorine has a residual effect, meaning that it remains active in the water for some time, providing ongoing protection against pathogens.

While bromine, ozone, and iodine can also be used for disinfecting pool water, they are not as commonly employed in commercial pool settings as chlorine. Bromine is sometimes favored for indoor pools because it is less affected by pH changes and doesn't produce a strong chlorine smell; however, it is generally more expensive. Ozone is a powerful oxidizer and can effectively kill microorganisms, but it does not provide a residual effect, which means that it cannot maintain continuous sanitation in the same way chlorine does