Originally Posted by MarkKF
How much air space do you have? Cause I usually do 5 gal. in a 6 gal. primary. That's a lot of air space, quickly filled with a blanket of CO2.
Does Notty make more than 3 in. of krausen?
This has been my thinking as well. The CO2 will/should force out O2 at the beginning of fermentation. And even if you remove the airlock for a short time the CO2 being heavier should hold out O2 while you clean up.
Now as far as other contaminates getting in that could be something to think about and a good reason for having a second airlock on hand to replace the clogged one.
Or just go with the blowoff tube for the first few days.