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Yeah, we use flash evaps running at around 162 - 170 F, just high enough to kill bacteria but minimize scaling. The only treatment involved at that point is an anti-foaming compound that also helps keep the scale soft enough to be chemically cleaned when it gets too thick. Virtually none of that makes it through to the distillate though.
The distillate is not treated, there is a valve that sends it to the distilled water tanks, the potable tanks, or the bilge. When it's good enough to save, it's all the same water.
When distilled water becomes feed water there are so many chemicals added that it is technically contaminated water with potassium hydroxide added to obtain a pH of around 11 and until recently laden with hydrazine to scavenge oxygen, and more phospates than the runoff from a third world laundromat. Pretty nasty stuff and makes terrible tea that really would give you the runs.
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