System for proportioning fluids

A system for preparing a ready-to-use peritoneal dialysis fluid, the system comprising;

• a proportioning device connectable to a source of water;
• at least one source of first concentrate connectable to the proportioning device;
• at least one source of second concentrate connectable to the proportioning device;
• and optionally,
• at least one source of further concentrate connectable to the proportioning device,
• wherein said first concentrate comprises glucose at a concentration of 1.5 to 4 M and hydrochloric acid and has a pH of between 1.5 and 4, and wherein the first concentrate is free of buffer selected from acetate, lactate, citrate, pyruvate, carbonate, bicarbonate, and amino acid buffer, and free of electrolyte selected from sodium and potassium, and wherein the first concentrate is formulated for dilution with water at a ratio of 1:10 to 1:33;
• and
• wherein said second concentrate comprises a physiologically acceptable buffer which has a pH of between 5.5 and 9.0.