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One of the large benefits of peristaltic pumps is that the only thing that the liquid touches is the tube.

Ah, that's great. For those wondering how: https://en.wikipedia.org/wiki/File:Peristaltic_pump.gif

The liquid should not touch anything outside of the tubing or tubing interconnects, so it shouldn't matter so much if the parts don't meet FDA requirements.

It needs some kind of cleaning cycle (unless all your ingredients are hard liquor...)