It need not be "big", persay, but it should be relatively larger than the flask size. About 1.5x or 2x the size(inflated). This just always worked best for SWIL. With really clean precursors, it's best to have more "expansion" room, without all of the xtra O2 mollys floating around. The big balloon, allows for more gas to be produced, in the smallest space necessary. The rxn will take room as it is needed.
Sturdy, well, don't wanna leak does SWIU?
Lukky D
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