Several properties of the solid wall are affected by the adsorption of the ions, including the surface atomic roughness and the surface net charge. In order to isolate the effects of the surface roughness on T 1 , simulations were performed in a simplified configuration: the pores were made of NaCl solid walls, and a fraction 1-r of the atoms of the last layer were randomly deleted, thus creating a rough surfaces. The total charge of both surfaces was ensured to be equal to zero after atoms were deleted. The pores were then filled with pure water, and the desorption of the surface ions was prevented by means of harmonic potentials maintaining the wall atoms near their original positions. Our results show that varying the roughness r of the pore surface has a strong impact on T 1 , with T 1 being as low as 0.5 s for r = 1 %, as compared to the value of 3 s for reference surface NaCl(100) (Fig. ). The lowest value of T 1 is obtained for r = 1 %, which corresponds to the limit of very few additional NaCl atoms at the solid surface.