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As there is no secondary fermentation when brewing in kegs as you use CO2 gas, how do you calculate the added amount of sugar in the brewing process to achieve the same end result. Sue

  • It's a bit unclear what you're asking here. You say 'no secondary fermentation' but then ask how much sugar you need (which, if added, will induce a secondary fermentation). Are you asking how to use force-carbonating methods to achieve the same carbonation level as a certain amount of priming sugar? – Franklin P Combs Feb 23 '15 at 18:08
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When serving beer from a keg, there is no need to add sugar after fermentation, as you mentioned, no secondary fermentation occurs so it is not needed.

Instead, you set the pressure of the CO2 in order to obtain the carbonation required at the serving temperatures. I personally use BeerSmith to calculate this value for me.

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  • If you don't use beersmith, there's a lot of other options on carbonation calculators or charts online for free, just search it! – jards Feb 23 '15 at 20:13
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If you are referring to keg or cask conditioning, the rule of thumb from Papazian's Joy of Homebrewing is

1/3 cup corn sugar per 5 gallons. ... Excessive foaming will result from the normal rate... The keg is then sealed and set aside for 1-2 weeks.

(At room or cellar temps, NOT in the fridge.) Good luck.

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