1. A small abdominal incision is made, and a catheter is inserted into the peritoneal cavity. A bag of dialysate is attached to the catheter; the fluid passes into the cavity, where it is left for several hours. Used fluid is then drained out of the abdomen.
2. Waste products, and excess water from the blood vessels lining the peritoneal cavity, seep through the peritoneal membrane into the cavity and mix with the dialysate. The fluid is allowed to drain out (by the release of a clamp) through the catheter and into the empty dialysate bag.
3. The bag is discarded and replaced with a bag containing fresh dialysate. The procedure, which takes about an hour, can be performed during the day or overnight.
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