System and method for producing fluid for peritoneal dialysis

A system for producing fluid for peritoneal dialysis (PD), the system comprising:

• a fluid path including one or more PD-concentrate connectors each configured to be connected to one or more sources of PD-concentrate fluid, and a water connector configured to be connected to a source of water;
• a forward osmosis (FO)-unit including a draw side and a feed side separated by a FO-membrane, the FO-unit fluidly connected to the fluid path, wherein the FO-unit is configured to receive one or more PD-concentrate fluids at the draw side, and to receive water at the feed side, and wherein purified water is transported to the one or more PD-concentrate fluids through the FO-membrane by means of an osmotic pressure gradient between the draw side and the feed side, whereby the one or more PD-concentrate fluids is diluted to produce a diluted PD-concentrate fluid;
• a concentration sensor configured to sense a concentration of the diluted PD-concentrate fluid;
• a container fluidly connected or connectable to the fluid path, wherein the container is arranged to receive the diluted PD-concentrate fluid, and wherein the fluid path includes a first recirculation fluid path including the draw side of the FO-unit and the container;
• and
• a control arrangement configured to:
• control a degree of dilution of the one or more PD-concentrate fluids based on the sensed concentration and by recirculating the diluted PD-concentrate fluid in the first recirculation fluid path such that one or more predetermined criteria are fulfilled, and
• direct the diluted PD-concentrate fluid to an outlet connector while sensing a pressure, with a pressure sensor, of the diluted PD-concentrate fluid provided to the outlet connector for controlling the pressure of the diluted PD-concentrate fluid.