What is the most common method to disinfect swimming pool water?

Chlorination is the most common method to disinfect swimming pool water because it effectively kills a wide range of harmful microorganisms, including bacteria, viruses, and algae. Chlorine is a strong oxidizing agent that reacts with contaminants in the water, providing comprehensive sanitation. This method is widely recognized for its efficiency, affordability, and ease of use, making it the standard choice for pool operators.

Chlorine can be added to the water in several forms, including gas, liquid, or solid tablets, and it works well to maintain a residual level of sanitizer in the pool, which is critical for ongoing pathogen control. Furthermore, chlorinated pools often have established guidelines and best practices for dosage and maintenance, improving public health safety standards.

Other disinfection methods, such as ozone treatment and ultraviolet light, offer complementary benefits and can improve water quality; however, they typically serve as additional sanitation steps rather than standalone solutions. Bromination, while effective, is less commonly used due to its higher cost and specific usage contexts, often appealing to indoor pools or spas where chlorine's strong odor might be a concern.