Heater-Cooler System 3T • Routine maintenance
6.12 CP_IFU_16-XX-XX_USA_015
6.4 Changing the water
The water in the water circuits must be changed every 7 days.
In order to prevent microbial growth, add 150 ml (5 US fl. oz.) of medical grade 3% hydrogen
peroxide solution to the tank contents.
Note:
Medical grade 3% hydrogen peroxide solution mixed with filtered tap water at a 1:91 ratio results in a
concentration of use dilution of 1.1% (the outcome of this is a peroxide concentration of 330 ppm).
Note:
Pay attention to hand hygiene and protective barriers by disinfecting your hands and using
disposable gloves.
!
Note:
Do not use de-ionized or reverse osmosis processed water. This water can cause deterioration on
the refrigeration system.
◗ Drain the water tanks and ensure that the drain valves are closed once the tanks are empty.
◗ Fill the tanks as described in chap. 5.2.
Note:
The hydrogen peroxide concentration in the water can be measured semiquantitatively during the
draining procedure by visual comparison of the reaction zone of a test strip with the fields of a
color scale (e.g. MQuant, Peroxide Test, Method: colorimetric with test strips, 100 - 1,000 mg/l
H2O2, Reference 1.10337.0001). Before measuring, water should be drained for at least
10 seconds with fully opened drain valves.
The hydrogen peroxide concentration will decrease over the 7-day-period until the next water
change, but should not drop below 100 ppm. If you measure concentrations below 100 ppm,
perform the disinfection as described in chap. 6.3.1.
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