The peritoneum is a semi-permeable membrane that covers the abdominal cavity and acts as a sieve to filter out anything harmful to the body. During peritoneal dialysis, a special fluid called “peritoneal dialysis fluid” is pumped into the abdominal cavity through a “peritoneal dialysis catheter”. The peritoneal cavity is lined with waste and excess water from the blood on one side and “clean” peritoneal dialysis fluid on the other side, and the metabolic waste and excess water from the blood runs through the peritoneum into the peritoneal dialysis fluid. After a period of time, we release this peritoneal dialysis fluid containing metabolic waste and excess water from the peritoneal cavity and fill it with new peritoneal dialysis fluid, thus continuously circulating and eliminating toxins and excess water from the body.