Halazone is primarily used as a disinfectant for the purification of drinking water, especially in emergency or field conditions where access to clean water is limited. It effectively kills bacteria and inactivates many viruses and protozoa that can cause waterborne diseases such as cholera, typhoid, and dysentery. Halazone is commonly supplied in tablet form, making it portable and easy to use—each tablet is added to a specific volume of water and allowed to dissolve, initiating the disinfection process within minutes. Due to its simplicity and effectiveness, it has been widely used by military personnel, hikers, and relief workers in areas with contaminated water supplies. However, its use has declined in recent years due to the availability of more stable and efficient alternatives, and because its effectiveness can be reduced in cloudy or cold water.