Table 2. Results of colony count in plates in group B.
| sample no. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| water outlet | 250 | 170 | 200 | 150 | 260 | 310 | 210 | 180 | 210 | 290 |
| air outlet | 11 | 7 | 5 | 0 | 0 | 5 | 0 | 8 | 4 | 0 |
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