A form of peritoneal dialysis that needs no machine. With capd, the blood is always being cleaned. The dialysis solution passes from a plastic bag through a catheter and into the abdomen. The dialysis solution stays in the abdomen with the catheter sealed. After several hours, the person using capd drains the solution back into a disposable bag. Then the person refills the abdomen with fresh solution through the same catheter to begin the cleaning process again.