Which of the following processes is not involved in the purification of drinking water?

Options

A. Sedimentation
B. Filtration
C. Chlorination
D. Distillation

Explanation

To determine which of the following processes is not involved in the purification of drinking water, we will analyze each option provided in the video transcript.

1. **Sedimentation**: This is a process where solid particles in water settle at the bottom due to gravity. This process is commonly used in water treatment to remove larger particles and impurities from water. Therefore, sedimentation is involved in the purification of drinking water.

2. **Filtration**: In this process, water is passed through filter paper or other filtering materials to remove smaller solid particles that did not settle during sedimentation. This is also a standard method used in the purification of drinking water. Hence, filtration is involved in the purification of drinking water.

3. **Chlorination**: This process involves adding chlorine to water to kill harmful bacteria and pathogens. Chlorination is a crucial step in ensuring that drinking water is safe for consumption. Therefore, chlorination is involved in the purification of drinking water.

4. **Distillation**: This process involves heating water to create steam and then cooling the steam to obtain purified water. Distillation is effective in removing impurities, including dissolved salts and other contaminants. Thus, distillation is also involved in the purification of drinking water.

Now, we need to identify which of these processes is not typically involved in the purification of drinking water. Since all the mentioned processes (sedimentation, filtration, chlorination, and distillation) are indeed used in water purification, we can conclude that none of them is excluded.

However, if we consider common practices in water purification, we might find that distillation is less frequently used in municipal water treatment compared to the other three methods. Therefore, if we are to choose one process that is not as commonly involved in the purification of drinking water, it would be **distillation**.

### Final Answer:
**Distillation** is the process that is not typically involved in the purification of drinking water.