| Value | Category | Cases | |
|---|---|---|---|
| 1 | Do not use anything | 1 |
0.2%
|
| 2 | Water only | 143 |
35.6%
|
| 3 | Ash | 248 |
61.7%
|
| 4 | Sand | 3 |
0.7%
|
| 5 | Other | 7 |
1.7%
|
| 6 | Don't know/No response | 0 |
0%
|