To clean Iron Oxide deposit, calcification,
and other stubborn deposit, it is
recommended to use the Citric Acid from
the Service Kit (Order No.: 18570).
1. Ensure that the valves remain closed.
2. Mix some Citric Acid with 15 ml water.
3. Fill the Sample Glass Tube with the Citric
Acid liquid and let it soak over night.
4. Flush with clean water without gas.