Therefore, the water number density distribution at the brush-bulk interface should be the third quantity that should be probed. The LDA-based ML protocol also directs us to study the chloride ion distribution at the brush-bulk interface. We do that and find that chloride ions, too, show a similar increase in the concentration with the electric field at the brush-bulk interface [see Fig. ]. This suggests that while the brushes are undergoing a significant deformation and getting parallel to the brush-bulk interface, the counterions are not leaving the brushes: this is also confirmed from the corresponding screening efficiency (SE) result (for all electric field values, the SE is ~100%, indicating that the chloride ions never leave the brush layer) [see Fig.