When the treatment is done(3 hours or more depending on the amount to be pulled off) they are weighed again....the goal is to bring them a hair below 'normal' or 'normal'.
Fluid retention is bad. There are people who will gain 8 - 10 pounds or so between treatments....the more fluid to come off, the harder it is on your body, because the machine is trying to do oin 4 hours what your body does naturally 24/7.
Those on CAPD don't have that weight problem....but they have to worry about peritonitis.