From: Hygienic safety of reusable tap water filters (Germlyser®) with an operating time of 4 or 8 weeks in a haematological oncology transplantation unit
Operating time (weeks)
trial 2/filter type 1 (n samples)
trial 3 (filter type 2) (n samples)
trial 4 (filter type 3) (n samples)
1
3.1 ± 5.9 (78)
7.3 ± 8.8 (54)
14.4 ± 17.5 (18)
4
-
20.0 ± 27.4 (54)
3.8 ± 4.6 (18)
8
6.3 ± 11.5 (18)