Chlorine is a disinfectant added to water to kill harmful microorganisms. While effective, it can form byproducts. It's widely used in water treatment systems worldwide.

Chlorine was first introduced for water treatment in the early 1900s, revolutionizing public health by dramatically reducing waterborne diseases. It's intentionally added during the treatment process, reacting with organic matter to form byproducts. While effective and economical, leading to its widespread adoption, chlorine can impart a distinct taste and odor to water at higher concentrations. At regulated levels, it's considered safe for consumption, but some people may be sensitive to its effects.