The invention relates to a method for a filter press using a non-mineral oil. The invention is characterized in that palm oil or palm kernel oil is used as the non-mineral oil as a hydraulic oil in the oil circuit, wherein the palm oil or palm kernel oil is conducted in the circuit and at a pressure greater than approximately 150 bar and the temperature is held at a distance from the melting temperature. Said method leads to high stability of the oil and expands the usage possibilities of the filter press. The invention further relates to a system for performing the method.
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