Never used them, the price per gallon was to pricey for me, but I hate an answered thread. I would think that around 1/6 to 1/8 volume should give you a good pressure. Of course you you could chill them down and then put in 30lbs of pressure, vent the air and shake and force carbonate within a few hours.
I think you just need to experiment with them on the first batch and see what you like.
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In Primary: Belgium Chimay clones.
In Secondary: Braggot, pale ale, end of the world white.
Conditioning: Mead, Cider, braggot, Belgium Wheat.
On Tap: Clones, Chimay Blue, Red, Porter, malted cider.
Bottles: Far, far, too many to list.
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