Dialysis treatment can be performed in two ways: hemodialysis or peritoneal dialysis. In hemodialysis, the patient’s blood is passed through a machine that filters out waste products and excess fluid from the blood, and the cleaned blood is returned to the patient. In peritoneal dialysis, dialysis fluid is introduced into the abdominal cavity through a catheter, where it collects waste products and excess fluid, and the fluid is changed regularly.