My first FV was a Richies 25 litre with a hole for an airlock, this bucket is air tight and does not leak steriliser even when turned upside down, i recently bought a cheaper version from a home brew shop, unfortunately the first time i sterilised it i turned it upside down and it leaked slightly, yesterday (day two of fermentation) I noticed no activity from the airlock even though i could hear the wine bubbling, I noticed the lid bulging so assumed therefore the CO2 was escaping through the lid seal, my solution was to put a 2Kg bag of sugar in the centre of the lid this stopped it bulging and the airlock is now working as it should. :thumb:
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