The invention relates to a device for separating gas and liquid from a medium flowing in a line, and to a method for separating such a medium, in particular a gas-liquid mixture, in the device, which separates gas and liquid particles from one another at high and low flow speeds. The fiber may be obtained by a process, wherein there is admixed a carbonate as well as an absorbent polymer, in particular carboxymethylcellulose, to a viscose dope. In other embodiments, sections of a fourth storage area of the first type are replaced with pointers to the third storage area and optionally with pointers to the first storage area. Preferably, the top layer of the master layer is a cobalt alloy including from 1 to 5 at.