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
24.7
18.1
135