6.4 Preinfusion
With preinfusion, the coffee grounds in the portafilter are moistened before the actual brewing process
starts, so that the coffee grounds can expand evenly and close any channels that may have formed. This
ensures that the resistance in the filter is the same everywhere, which leads to a more even extraction.
Preinfusion is deactivated by default.
6.4.1 Activating the preinfusion