ZWILLING J.A. Henckels FRESH & SAVE VACUUM PUMP Manuel D'utilisation page 34

EN
The opening of the bag has to be completely clean and dry. Make sure the valve
on the inside of the bag does not come in contact with its contents. The pump
must not absorb any liquids (e.g. water, oil, meat juices). If you see that the pump
is sucking up liquids, immediately stop the vacuum sealing process by pressing
the On/Off button.
Remember to press down the PUSH button in the middle of the silicone valve after
each vacuuming process to finally seal the valve.
We recommend freezing liquid or soft foods prior to vacuuming.
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Use