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Table 5 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)

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

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)
  1. * only 1 filter (shower) exhibited 1 cfu/100 ml