9. Disinfection
• Dwell times
• Concentration of disinfectant
Routine maintenance
• Following hemodialysis machine manufacturer's
recommendations
If the contributor to the hemodialysis Instrument's contamination is
the water treatment system, check the following to determine the
cause:
Water treatment system design
• Type
Recirculates, holding tank, direct feed
Any holding tanks are strong suspects because of the time
given for growth
Location of carbon tanks and filters
Dead legs in distribution lines
D. I. tanks, common bacteria source
• Membrane
Type
Age
Disinfection/cleaning procedures
Current flow and rejection rates
• Filters
Type
Age
Disinfection/replacement procedures
• Water treatment system operation
Recent changes
Long stagnation times (non-use)
• Maintenance
Sample techniques
Disinfection procedures
Contamination from softeners, carbon beds, other filters
• Station sites infrequently used
The above causes of bacteria contamination are only a few of the
many possibilities that exist. Each unit has different water
treatment systems, dialysis machines, city water, disinfection
chemicals, dialysis concentrates, etc.
157-1278-916, Rev A 9-47
March 2004
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