The bung for my carboy keeps wanting to pop out. It is just resting on the top in the carboy hole? Is this ok what do I do?View attachment ImageUploadedByHome Brew1473481371.101810.jpg
During primary fermentation you only need the airlock to keep bugs out. There will be so much CO2 produced that not much else can get in. You could just cover the opening with a cloth and be just fine for several days.
It's for secondary fermentation so do I need a air lock or could I just cover it with tin foil
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