Slit nanopore systems were constructed out of a salt crystal of approximate lateral dimensions 4 × 4 nm 2 and approximate thickness 1.2 nm to create a slit geometry. The slab was filled with fluid composed either of pure water, or of a salt solutions of given concentration c s . The system was first relaxed at a temperature T = 20 • C in the NVT ensemble for 50 ps. Then, the system was compressed in the anisotropic NPT ensemble with an imposed pressure P z = 1000 bar along the z axis, an imposed pressure P xy = 1 bar along the x and y axis, and a temperature T = 20 • C for 100 ps , thus ensuring the contact between liquid/solid interfaces. The system was then equilibrated for 5 ns in the anisotropic NPT ensemble with P xy = P z = 1 bar at T = 20 • C. Finally, production runs with high temporal resolution of the saved configurations of 0.05 ps were performed in the NVT ensemble for 2 ns, as well as a low resolution production run of 200 ns length during which configurations were saved every 5 ps. Simulation input scripts are available in the DaRUS repository .