Table 1. Results of colony count in plates in group A.
| sample no. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| water outlet | 25 | 10 | 5 | 10 | 0 | 0 | 10 | 15 | 0 | 0 |
| air outlet | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 |
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