In order to probe electrolyte insertion in zeosils in the osmotic ensemble, we used our recently released implementation version of the NCMC move 55 with a relative probability set to 10 -3 . The NCMC move consists of T = 200 steps, each one involving a perturbation of the system through interpolation of non-bonded parameters of the chosen molecules to be transformed, followed by relaxation with 200 MD steps with a timestep of 1 fs in the NVE ensemble. All simulations used a Nosé-Hoover thermostat, setting the temperature at 300 K.