I'm new to this blog and brewing. Recently i put down my first Coopers Real Ale. All went well, great flavor but flat to very slight carbonation in bottles. 1.5 tsp in 1250ml and .5 tsp in 750ml bottles. Is this too little? I wanted to avoid making bombs. It was in primary for 6 days after it had finished working. Any advice out there? Cheers G
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 out half a teaspoon so it could easily have been less.
A carbonation calculator can help you find out how much sugar to use.
Rather than adding sugar to each bottle, you are better off weighing the total amount sugar and boiling that in some water and adding that to the bottling bucket before racking from the carboy. Less chance of contamination and weighing errors.