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Table 4 Total bacteria at 22°C (mean cfu/ml) from weekly testing of filters changed monthly (each n = 18, trial 3)

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

Month cfu/ml
  week 1 week 2 week 3 week 4 control before changing
1st 12.4 13.4 23.1 14.0 540
2nd 3.8 1.6 8.8 28.9 273
3rd 5.6 8.8 24.7 18.1 135