@Paul_KD7HB I am planning to put 3 pumps per bottle. My first plan was to use the peristaltic pump, so I thought to keep some of the liquid in the tube, since the process has not to be precise: I just want all the liquid to move, and in the end I will lose the "X" mL which remain in the tube, but it's not important. Thinking about a different kind of pump, I actually have no idea unfortunately.