The present invention relates to a peritoneal dialysis system comprising at least one peritoneal dialysis machine, wherein the peritoneal dialysis system furthermore has at least one water unit for preparing and/or metering water and at least one concentrate container, wherein the concentrate contains has at least one connector or is in communication therewith and wherein the water unit and/or the peritoneal dialysis machine has at least one receiver for the connector, wherein the connector has at least one piece of information, preferably in the form of a barcode, that represents the quantity of the water to be filled into the concentrate container or enables conclusions thereon, and wherein the water unit or the peritoneal dialysis machine is configured to read this information and to carry out or initiate the addition of water in accordance with the information read.
