The present invention relates to an apparatus for performing an automated peritoneal dialysis treatment on a patient, the apparatus comprising: a first dialysis fluid port for receiving a first dialysis fluid having a first composition, which is determined by the concentrations of a set of first dialysis fluid constituents； a dialysis fluid line system connecting the first dialysis fluid port to a patient terminal； at least one dialysis fluid pump acting on the dialysis fluid line system and configured to convey the first dialysis fluid from the first dialysis fluid port to the patient terminal； and a control unit operably connected to the at least one pump； wherein the apparatus further comprises a second dialysis fluid port for receiving a second dialysis fluid having a second composition, which is determined by the concentrations of a set of second dialysis fluid constituents. The invention further relates to a system for automated peritoneal dialysis treatment and a data carrier comprising controlling software for such apparatus or system.
