Table 3 Microbiological results with weekly (1–7) and monthly (11–31) test intervals in trial 2
Filter No. | Parameter | Sampling week | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | 11 | 15 | 19 | 23 | 27 | 31 | ||
1 | Total bacteria (cfu/ml) (22°C/36°C) | 6/2 | 2/4 | 0/0 | 1/1 | 11/23 | 3/7 | 3/1 | 0/1 | 0/1 | 0/2 | 0/0 | 29/72 | 5/8 |
2 | 2/0 | 21/3 | 1/0 | 2/3 | 32/16 | 2/3 | 1/1 | 2/0 | 0/0 | 10/98 | 21/30 | 10/13 | 20/18 | |
3 | 0/3 | 3/5 | 4/0 | 5/7 | 6/10 | 0/8 | 1/1 | 0/0 | 0/10 | 45/70 | 0/1 | 1/6 | 1/3 | |
4 | 3/2 | 0/0 | 0/2 | 11/4 | 6/25 | 0/2 | 1/2 | 0/0 | 0/0 | 6/3 | 1/0 | 12/10 | 2/0 | |
5 | 2/0 | 0/1 | 1/1 | 10/12 | 8/4 | 7/8 | 0/1 | 5/0 | 5/0 | 2/4 | 5/0 | 21/13 | 0/1 | |
6 | 1/1 | 1/1 | 0/2 | 0/10 | 9/11 | 3/1 | 4/3 | 0/0 | 8/3 | 9/0 | 1/0 | 8/18 | 1/0 | |
1–6 | Pathogens* (cfu/100 ml) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
1–6 | Legionella spp.(cfu/1000 ml) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
results without filter (unfiltered water load) | Legionella pneumophila serogroup 1 | 1 | 10 | 0 | 0 | 500 | 800 | 944 | 370 | 0 | 270 | 22 | 0 | 173 |
P. aeruginosa | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 20 | 0 | 0 | 0 | 0 | |
Total bacteria (cfu/ml) | 2/3 | 4/207 | 0/6 | 35/18 | 24/76 | 17/26 | 7/8 | 0/0 | 138/14 | 8/5 | 12/0 | 9/22 | 6/2 | |