i was under the impression that saturating the aqueous layer with NaCl was about reducing the volume of hiding places for other molecules, in the most benign way, chemicly.
when swim dreamt of trying it, some salt managed to get into the np, and it seemed silly.
what Kord says makes some sense to me, if only beecause salty water is denser than unsalty water, and might afford a more pronounced dividing line beetween it and a lighter np.
i'd bee curious if salt is helpfull when using a heavier-than-water np?