| Value | Category | Cases | |
|---|---|---|---|
| -9999 | inapplicable | 0 |
0%
|
| -3 | non-response | 0 |
0%
|
| -2 | non response | 73 |
0.6%
|
| -1 | non response | 0 |
0%
|
| 0 | dont use | 11759 |
90.4%
|
| 1 | refining or filtering | 1125 |
8.7%
|
| 2 | using disinfectants | 46 |
0.4%
|