| Capacity of tanks | Number of Respondents | (%) |
| 1000 litres | 9 | 8 |
| 2000 litres | 24 | 22 |
| 2000 - 5000 litres | 69 | 64 |
| 5000 - 10,000 litres | 5 | 5 |
| More than 10,000 | 1 | 1 |
| Total | 108 | 100 |