Hot answers tagged bottle-conditioning
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A typical 20 liter batch uses around 120g of table sugar, or 6g per liter.
One teaspoon of sugar is about 4.2g. So when you used 0.5tsp in 750ml that's 2.1/0.750 = 2.8 grams per liter, which is less than half the typical 6 grams per liter. For 1.5tsp in 1250ml, that's 1.5*4.2/1.25 = 5g/l so much closer, but still undercarbonated - it's quite hard to measure ...
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