Follow-up question...
What about a 1 gallon jug for only a 1000ml starter... is head-space a concern with too much oxygen? Is a sanitized foam stopper good to use? Or is foil better?
I rubberband a coffee filter to my jugs and then top with foil. No right or wrong way as long as you don't use an airlock.
I use a jug also AND even with the convex bottom I can still use it on my homemade stir plate!
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