Which chemical is commonly used to disinfect pool water?

Chlorine is widely used in swimming pools as a disinfectant due to its effectiveness in killing germs and pathogens. It works by releasing free chlorine in the water, which is a powerful oxidizer that destroys bacteria, algae, and viruses, ensuring the water remains clean and safe for swimmers. Additionally, chlorine remains effective over time, providing residual disinfection, meaning it continues to work even after it has been added to the pool.

Other options, such as hydrogen peroxide, can also act as a disinfectant but are less commonly used for this purpose in pools. While ozone is an effective oxidizer and disinfectant, it is often used in conjunction with other sanitizers like chlorine, rather than as the sole means of disinfection. Bromine is another alternative that is effective, especially in hot tubs, but chlorine remains the most prevalent choice for traditional swimming pools due to its cost-effectiveness and established use in the industry.