The main thing is it woould defeat one of my favorite features of our skimmers, when the cup is full it shuts down, the back pressure from the skimmate collapses the foam column, I am curing 80lbs of rock right now and my cup on the 3130/2 I am using fills every 3-4 days, 700ml of skimmate. Normally this would be about 10-14 days though.