How are wastes and excess water actually eliminated during peritoneal dialysis?

Its in the bag: Glucose in pd bag absorbs water and removes excess fluid from body during dialysis. Wastes or toxins from blood travel from tiny blood vessels called capillaries in the abdomen to the fluid filled during peritoneal dialysis. Wastes are simply moving from high concentration in blood to low concentration solution by a process called diffusion.

Concentrations: Concentrations of waste are zero in the dialysis fluid. Combined with the glucose and other substances in the dialysis fluid "drags" waste and water out of the blood and changing the bags as has been prescribed by your kidney doctor results in less waste and water in the body. It's all based on the behavior of fluids and physical chemistry. Great question!