A kidney failure treatment system (160) is described. The system comprises: a dialysate supply (12)； a weighing device (50)； a control container (132)； a diffusion membrane (18)； a drain (14, 24)； first, second and third pumps (20a, 20b, 20c)； and first, second and third fluid conduits (16, 22, 126). The control container is coupled operably to the weighing device and is divided into fresh dialysate and spent dialysate portions (134, 136). The first fluid conduit is coupled fluidly to the dialysate supply and the diffusion membrane. It is also coupled operably to the first pump. The second fluid conduit is coupled fluidly to the diffusion membrane and the drain. It is also coupled operably to the second pump. The third fluid conduit is coupled fluidly to at least one of the fresh and spent portions of the control container. It is also coupled operably to the third pump.
