Disinfection is perhaps the most critical function of chemical dosing. It involves the introduction of chemicals such as chlorine, chloramines, or ozone into the water to kill or inactivate harmful microorganisms. Chlorine, for example, is widely used due to its effectiveness and residual properties, which help to maintain water quality throughout the distribution system. The careful dosing of disinfectants is essential to balance efficacy and safety; too little may not effectively kill pathogens, while too much can lead to the formation of harmful byproducts.