Which of the following methods is used to disinfect nonpotable water?

The method of using calcium hypochlorite to disinfect nonpotable water is widely recognized for its effectiveness in killing pathogens and making water safe for use. Calcium hypochlorite is a chemical compound that releases chlorine, which is a potent disinfectant. When added to nonpotable water, it helps to eliminate bacteria, viruses, and other microorganisms that may be present, rendering the water safer for various applications.

In contrast, while solar heating can assist in the disinfection process through the application of UV rays, it may not be as reliable as chlorine treatment for ensuring thorough disinfection in all conditions. Boiling is an effective method for disinfection; however, it is not the only method available, and sustained boiling is often impractical for large volumes of water. Filtration through sand is effective in removing sediment and some contaminants, but it does not eliminate all pathogens. Thus, calcium hypochlorite stands out as a practical and efficient choice for disinfecting nonpotable water, particularly in emergency situations or where traditional treatment facilities are not available.