Which of the following method is not employed in the purification of water supplied to our homes ?

Options

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

Answer

To determine which method is not employed in the purification of water supplied to our homes, we can analyze the common water purification methods and their applicability to large-scale water supply systems.

### Step-by-Step Solution:

1. **Identify Common Water Purification Methods**:
- The common methods of water purification include sedimentation, filtration, chlorination, and boiling.

2. **Understand Each Method**:
- **Sedimentation**: This process involves allowing heavier particles to settle at the bottom of a container. It is effective for removing larger impurities from water.
- **Filtration**: This method uses a filter to remove smaller particles and impurities from water. It can be done on a large scale.
- **Chlorination**: This involves adding chlorine to water to kill bacteria and other pathogens. It is widely used in municipal water treatment.
- **Boiling**: This method involves heating water to kill bacteria and pathogens. It is effective but typically used for small quantities of water.

3. **Evaluate Applicability to Large Quantities**:
- Sedimentation, filtration, and chlorination can all be applied to large quantities of water in municipal treatment facilities.
- Boiling, on the other hand, is impractical for large-scale purification as it is time-consuming and requires significant energy.

4. **Conclusion**:
- Based on the analysis, boiling is the method that is not employed in the purification of water supplied to homes on a large scale.

5. **Final Answer**:
- The method not employed in the purification of water supplied to our homes is **boiling**.