"Martin Baxter" wrote

ahh that'll do but to put it as simply as possible, fresh water is
lighter and thinner than salt so it gets in easier.

Thinner? You have some viscosity data to back this up? More likely fresh
water exhibits a higher osmotic pressure because the difference in water
concentration is greater in fresh than brine. (osmotic pressure being
proportional to the differences in concentration on either side of the
membrane)

Even though Marty has the clap, he still sounds smart.

SV