Miele PFD 100 SmartBiz Operating Instructions Manual page 46

Detergent
 Remove the siphon from the canister
and place it in a container of water.
 Start "Vent dispensing system" twice
(see "Settings menu, External
dispensing") to the rinse the system.
 Then place the siphon in the new
canister and start "Vent dispensing
system" again.
The dispensing system is ready for
operation.
Always follow the recommendations
of the detergent manufacturer
whether using powder or liquid
detergent.
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