Final answer:
Superchlorination is accomplished by chlorinating the water to a concentration of at least 3.0 ppm for a certain duration.
Step-by-step explanation:
Superchlorination is accomplished by chlorinating the water in a container or distribution system to a concentration of at least 3.0 ppm. The duration of the superchlorination process can vary depending on the specific situation and the desired outcome. For example, in swimming pools, superchlorination is often done by adding a shock treatment of chlorinating chemicals such as calcium hypochlorite or liquid chlorine, which rapidly raises the chlorine level to 10-20 ppm for a short period of time, usually 6-24 hours.