 Approximately 10-20 prevalent hemodialysis patients will be recruited. Subjects will randomized to receive one weekly hemodialysis treatment using each of the two acetate acid dialysate buffers of NaturaLyte and GranuFlo, which will be assigned in a random fashion. Acetate and bicarbonate concentrations will be assessed before, at eight time points during, and six time points after the completion of hemodialysis. 