| Value | Category | Cases | |
|---|---|---|---|
| 1 | Ash | 94 |
24.7%
|
| 2 | Do not use anything | 1 |
0.3%
|
| 3 | Don't know | 6 |
1.6%
|
| 4 | Other | 2 |
0.5%
|
| 5 | Sand | 7 |
1.8%
|
| 6 | Water only | 270 |
71.1%
|