I am running a .5 LPM for 4 minutes with a .5 micron stone.
The rational behind this is that even if I did not get any O2 into solution the headspace is about 2 liters, so it should be fairly saturated. Any more than that and I figure what is not absorbed would just spill out the top of the carboy.
I'm not brewing the same beer enough to adjust the O2 and say if it is better or worse.
How would you recommend someone who is using this system answer the question this thread is about?