| Value | Category | Cases | |
|---|---|---|---|
| 1 | Chlorine (e.g Jik, water guard, pure) | 631 |
22.2%
|
| 2 | Boiling | 756 |
26.6%
|
| 3 | Filter | 65 |
2.3%
|
| 4 | Open sun | 34 |
1.2%
|
| 5 | None | 1340 |
47.1%
|
| 6 | Other | 17 |
0.6%
|