I'm using a rectangular cooler as my MT and if I open my nozzle too much, I get little air bubbles in the run-off hose. I'm worried about oxidation so to remedy this, I open the nozzle just enough so that the wort barely
trickels out; it's taking close to two hours to drain my MT.
I worry about oxidation? Does anyone else have this problem?
(the upside is that with the slow run-off I get about 78% efficiency