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Table 3 Microbiological results with weekly (1–7) and monthly (11–31) test intervals in trial 2

From: Hygienic safety of reusable tap water filters (Germlyser®) with an operating time of 4 or 8 weeks in a haematological oncology transplantation unit

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
  1. * P. aeruginosa, E. coli, coli-like, faecal enterococci