Both returns must be routed back into the bucket. Otherwise, you will draw all the fuel out of the bucket at any level lower than the lower cuff on the module. We have proven that in testing.
Frothing is not a concern. I have been getting calls lately that someone at Pureflow says that will happen.
I am here to tell you that it does not happen and if it did, so what?
Let me ask the fundamental question here. At the lowest tank levels when you are on the last burnable gallon of fuel searching for a station on the open hiway with a trailer in tow, cranky wife int he right seat and another "dependent" in the back seat wanting something to eat......
Would you prefer fuel with air on top of it, or no fuel?
And the froth is like the foam on your morning drink, it stays on top and this phenomenon occurs even in stock tanks. Further, it occurs with no returning fuel, but simple sloshing of the tank.