1.5 distillation?

[wpkluck]

OK, so I'm new, and there are those that love to tout their knowledge. I get it, and I'm learning. I'm trying to get to the mechanics of thump kegs. I get how they work, the lyne arm angle, pre-charge, puking. I'm very curious about those saying the product that goes thru a thumper is only a 1.5 distilled product, not double-distilled.

Distilling takes a liquid, evaporates it, in order to separate the lower BP liquid. The pot does that, AND the thumper does that. Why then, would some (not all, by the way, not even most, from what I can read) say this isn't a full distillation?

I'd hope this won't devolve into an "that's the way it is" discussion, I'm trying to illustrate the mechanics. I'd rather not focus on the peripheral issues, but if it does, let's all be respectful (and not assume facts not in evidence). I'm talking about a pot still, with a thumper. If it matters what you put in it (I can't see how, but I'm new, and open to new ideas!), state that too.

Thanks in advance for the conversation (as opposed to the expert-lecturers).