Peritoneal Dialysis The process of cleaning wastes from the blood artificially. This job is normally done by the kidneys. If the kidneys fail, the blood must be cleaned artificially with special equipment. One major form of dialysis is peritoneal dialysis. This is the process of cleaning the blood by using the lining of the abdominal cavity as a filter. A cleansing liquid, called dialysis solution, is drained from a bag into the abdomen. Fluids and wastes flow through the lining of the cavity and remain "trapped" in the dialysis solution. The solution is then drained from the abdomen, removing the extra fluids and wastes from the body.