2. To measure the effects of a 12-week course of adjuvant low-frequency icodextrin-based peritoneal dialysis to ongoing thrice-weekly maintenance hemodialysis on: inter-hemodialytic weight gain, achievable hemodialytic dry weight, total body water, ambulatory blood pressure, serum phosphorus, and pre-to-post hemodialysis changes in serum potassium and pH, and Kidney Disease Quality of Life-SF physical functioning, energy fatigue, and general health scores.