Water in the lower vessel during gradual heating
passes in a pair and expands upwards through
tube into the upper container. Water that has a temperature
always lower than 100 ° C, here for about
Stir with finely ground coffee for 1 minute.
After removing the heat source, the steam starts to change back
for fluid. A vacuum is created in the lower vessel,
which absorbs all the water through the filter into the bottom
containers. The result is very pure coffee without any hints
sludge and impurities.