A method and a device for leading media in a thermal treatment system for a liquid product where, determining the led-in volume of the expelling medium while a medium is being expelled from the treatment system and by setting the determined volume of the expelling medium in a ratio to a nominal capacity of the treatment system, the shutting off of a product pipe on the outlet side following a medium change on the inlet side can be accomplished independent in time of the performance of the medium change on the inlet side. This reduces product losses and permits the treatment of residual amounts remaining in the treatment system.
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