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11. Troubleshooting
Issue
Solution
Condensation on media plates
The media plates must be at ambient temperature for
optimal growth performance. If plates are stored in a
fridge, warming it up to 2 hours is recomended
The pump switch is not active
Check that there is no liquid on the switch
Small amount of liquid in the pump head after filtration
It is normal to observe a small amount of liquid in the
pump head, this does not impact the testing results
Large amount of liquid in the pump head after filtration
When filtering a volume larger than the capacity of
the filtration unit, the user should complete a proper
filtration cycle including the dry out step and continue
with the remaining volume(s).
Alternatively, the user must ensure that the filter is
always covered by 25 mL to 50 mL of liquid while
filtering.
Filtration unit leakage
The maximal sample temp is 60 °C (140 °F)
Sample is foaming out of the filtration unit
Use a 250 mL filtration unit
Membrane is broken after filtration
Check the lid position before starting the filtration. If
the lid is in closed position while filtering, the membrane
might break
Long filtration time
Change or check the filtration head gaskets and if issue
remains, run a pump performance testing — see section
4.1, Cleaning and maintenance
Sanitization
Impossible to install the kit
Remove the kit, place it back and turn clockwise — see
section 4.7, Pump internal flow sanitization
Leakage when pouring the purified water
Remove the sanitization funnel and check the position of
the funnel gasket