A method for the depletion of at least one component of a fluid medium includes increasing the concentration of the at least one component to be depleted before its depletion. An apparatus for the depletion of the at least one component of the fluid medium has a concentration increasing unit for increasing the concentration of the component of the fluid medium to be depleted and a depletion unit disposed downstream thereof and in fluid communication therewith for the subsequent reduction in the concentration of the component to be depleted.
