| Observation No. | Chlorine Dose (mg/L) | Residual Chlorine (mg/L) |
| --------------- | -------------------- | ------------------------ |
| 1               | 10                   | 0                        |
| 2               | 20                   | 1.329                    |
| 3               | 30                   | 3.987                    |
| 4               | 40                   | 1.329                    |
| 5               | 50                   | 3.544                    |
| 6               | 60                   | 3.1                      |


Answer the following assignment questions:

1. What are the major disadvantages of chlorination? Name some alternatives. 
2.