Re: Water makers.
Not familiar with it but my first thought is is it a 'purifier' or a 'desalinator'?... very different job description to clean up suspect tap water vs removing salt from sea water.. I suspect a Costco unit would simply be for purifying domestic fresh water.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)