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Clustering could affect both ion distribution and ion transport. Model calculations were recently carried out by Simons and Kedem8 for an array of rectangular pores in an ion-exchange medium, not assuming homogeneous ion distribution. From these calculations it appears that the distribution coefficient is quite sensitive to pore size, at given average charge density, but the relation between salt rejection and salt distribution is only slightly influenced. It is thus possible 3641 that in practice the correlation given in eq 6 is valid in systems for which not all the assumptions of the TMS model are justified. 961).