For example, when you vigorously shake pure water you'll produce Bubbles, but they rapidly coalesce and disappear.
The reason to use pure water is to limit the corrosion potential of the coolant water during normal operation.
And a good guess is that that vapor pressure here, it's pretty close to the pressure that you would guess by using this diagram with the pure water. But the key word is, it's pretty close.
So I've got, I just take fresh cells and plunk them into pure water solution.
The result is relatively pure water or the permeate generated on one side of the membrane, while on the feed water side a concentrated brine or reject solution is generated.
