The correct answer is D. Chlorination.
Chlorination is the most common method of disinfection for swimming pool water. It is effective in killing bacteria and viruses, and it is relatively inexpensive. Chlorine can be added to the pool water in the form of tablets, granules, or liquid. It can also be added through a chlorinator, which is a device that automatically adds chlorine to the pool water.
Chlorination is a safe and effective way to disinfect swimming pool water. However, it is important to use the correct amount of chlorine, as too much chlorine can irritate the skin and eyes. It is also important to test the chlorine levels in the pool water regularly to ensure that they are within the safe range.
The other options are not as effective as chlorination for disinfection of swimming pool water.
- Ultra violet rays treatment is a newer method of disinfection that is becoming more popular. It is effective in killing bacteria and viruses, but it is more expensive than chlorination.
- Lime treatment is an older method of disinfection that is not as effective as chlorination. It can also be harmful to the environment.
- Potassium permanganate is a chemical that can be used to disinfect swimming pool water. However, it is not as effective as chlorination and it can be harmful to the environment.