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In the manufacturing and bottling of mineral water and other beverages, compressed air is used for different purposes. As a sterile air i.e. oil and germ-free, it promotes and displaces liquids and aerates the beverage ingredients. Even as a purge gas for cleaning containers, it must be oil and germ-free. In addition, oil-free and partly dry compressed air is used as an auxiliary supply power in pneumatic delivery. Dry compressed air functions as an energy source for pneumatic actuators.