Cost info received on AEWP unit.
Shekar tells us in the comments that they are $3000 each. Damn. Parameter out of range. But it is another option as a backup, I guess. I guess I will have to stick with ion exchange resin, by far the cheapest way to remove salts if you regenerate it.
I wonder if there is a company out there that sells a small automatically regenerating mixed ion exchange resin bed unit….