The Olympic swimming pool in Sydney Australia is treated with ozone, not chlorine.

Ultraviolet light (UV), ozone treatment, and improved filtration can eliminate the use of chlorine and hazardous by-products in water treatment systems.

Hundreds of municipalities around the world are already using these alternative disinfection technologies, and several large cities in Europe are relying on those methods to deliver safe, chlorine-free drinking water to their communities. These include Amsterdam in the Netherlands, Nice and Paris, in France and Berlin, Munich and Muenster in Germany.

Chlorine-free alternatives that use oxygen, ozone, UV, ionic treatment and other methods are available to disinfect swimming pools, as well.