Recall chlorine, ozone and ultraviolet light as sterilising methods for potable water.

Chlorine, ozone, and ultraviolet light are key sterilising methods used to ensure potable water is safe for drinking. Chlorine is commonly added to water supplies to kill harmful bacteria and viruses, effectively disinfecting the water. Ozone, a powerful oxidant, can also eliminate pathogens and is often used in water treatment facilities. Ultraviolet light sterilisation involves exposing water to UV light, which disrupts the DNA of microorganisms, rendering them inactive. Each method plays a crucial role in maintaining water quality and public health by reducing the risk of waterborne diseases.