Social & Preventive Medicine The method of choice for purification of highly polluted water on a large scale is – A Boiling and chlorination B Chlorination only C Superchlorination followed by dechlorination D Ultraviolet light treatment 💡 Explanation The method of choice for purification of highly polluted water on a large scale is - ✓ Correct Answer: C. Superchlorination followed by dechlorination