The invention relates to a process for removing foam in a lye container as a result of a program step, provided for dehydrating the lye container, with a lye discharge system arranged on the floor of the lye container with a lye pump and with a sensor for determining the level of the liquid in the lye container, whereof the sensor signal p is recorded during operation of the lye pump. According to the inventive method, the foam is detected in a detection range in such a way that through determining a change rate (Deltap/Deltat) of a curve (p/t) of the sensor signal, and through determining a component of the curve (p/t) of the sensor signal, the component is a specific change of the change rate (Deltap/Deltat), and through comparing the successive level gradients of (Deltap1/Deltat1 to Deltap2/Deltat2,..., Deltapn-1/Deltatn-1 to Deltapn/Deltatn; wherein a foam-treating measure that is adapted to the type of the component is initiated if the component is present.