TABLE 1.
Comparison of viable counts from the DUWS water samples
| Sample | Viable count (CFU · ml−1) from water samples taken from:
|
n | |||||
|---|---|---|---|---|---|---|---|
| Water lines
|
Air rotor water lines
|
||||||
| Geometric mean | Minimum | Maximum | Geometric mean | Minimum | Maximum | ||
| Water type | |||||||
| Soft | 2,590 | 7 | 31,000 | 1,224 | 0 | 40,000 | 11 |
| Hard | 3,290 | 32 | 64,000 | 5,063 | 0 | 95,000 | 33 |
| Deionized | 1,740 | 68 | 40,000 | 2,699 | 55 | 30,000 | 9 |
| Distilled | 5,970 | 4,400 | 8,100 | 2,013 | 1,350 | 3,000 | 2 |
| Supply type | |||||||
| Tank fed | 1,550 | 480 | 3,700 | 1,881 | 360 | 7,400 | 3 |
| Bottle fed | 3,583 | 7 | 36,000 | 1,802 | 0 | 95,000 | 32 |
| Main fed | 2,217 | 32 | 64,000 | 4,914 | 42 | 40,000 | 20 |
| Total | 2,874 | 7 | 64,000 | 3,325 | 0 | 95,000 | 55 |