The effect of minor additives of fluoride ions and phosphorus oxide on the leaching kinetics of two-phase sodium borosilicate (SBS) glasses in HCl aqueous solutions and the structural parameters of porous space of leached glasses have been investigated in order to create new vitreous nanostructured membranes with controlled parameters of the porous structure. It has been demonstrated that porous glasses (PGs) obtained from the two-phase glass of a modified composition have larger pores with a lower specific surface area in comparison to PG produced from the base SBS glass.