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Paired filtration dialysis (two-chamber haemodiafiltration) was evaluated as a short, highly efficient renal replacement therapy in 35 uraemic subjects belonging to three different dialysis centres. The study period was 1 year. Patients were divided into two groups according to their body-weight and drinking habits. The smaller patients underwent 150-min dialysis sessions three times weekly. The larger patients underwent 3-h treatments thrice weekly. The treatment was adequate in all patients according to the KT/V criteria of adequacy. The intradialytic symptomatology was remarkably low and the treatments were well tolerated in all patients. The study confirms the reliability of aired filtration dialysis as a short dialysis technique. In some patients 150 min may be insufficient to achieve an equate dialysis efficiency and 180 min may be required for the majority of the population.