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Total bacteria and P. aeruginosa (mean cfu/ml or/100 ml) of filters with operating time of 8 weeks (each n = 18 samples, trial 4)
| Test parameter | cfu/ml | |||
| week 2 | week 4 | week 8 | control before changing (final reduction %) | |
| total bacteria 22°C | 14.4 | 3.8 | 6.3 | 607 (99) |
| total bacteria 36°C | 29.4 | 14.5 | 34.7 | 635 (94.5) |
| P. aeruginosa | 0 | 0 | 0.06* | 344 (97.5) |
| Moulds | 1 | 0.1 | 0 | 5.2 (100) |
* only 1 filter (shower) exhibited 1 cfu/100 ml
