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I will occasionally "pour" the CO2 from the flask, since it is heavier than air, I tip the flask enough that any CO2 will come out and be replaced by room air. Then back on the stir plate. I don't know how much air exchange I get using the small plastic containers inverted on the top of the...

I have saved a lot of the little plastic cups that dip, etc. come in at restruants in our area and I simply sanitize one of them and set it inverted on top of the beaker. It acts as a shield, but doesn't seal it. I've always had good results with mine. I put some yeast from my fermenter this...