I'm carbonating my cider in 1 gallon glass carboys and my solid rubber bungs popped off a few times so I tied them down with cable ties. Can anyone tell me if this is ok and the carboy can take the pressure. I used 4 teaspoons of sugar per 1 gallon carboy, and keep at room temperature. Thanks
TAKE THE STOPPER OUT! THIS IS A SERIOUS ACCIDENT WAITING TO HAPPEN!
Unlike glass bottles, glass carboys are not designed to hold pressure.
4 tsp in 1 gallon will produce about about 2.4 volumes of CO2. The pressure created will be significant - at a minimum 22 PSI, but likely more than that, since fermentation proceeds quicker than the CO2 will dissolve, into the beer. Assuming you have little headspace, the pressure could be easily many times that.
Carboys are not designed to hold pressure, If I were you I would airlock it, let the added sugar ferment out and then bottle.
You could potentially have an explosion waiting to happen...at best you will end up with a cracked and broken carboy