I carbonated my keg with 30 psi over night. When I started to bottle (growlers) I noticed that there wasn't much carbonation.

Can I put the beer back into the keg and continue to carbonate? Will this affect the remaining beer?

I am going to give it a go. Pouring it gently back into the keg and upping the CO2 to 35 psi and check it tomorrow. Any thoughts?

3 Answers 3


Oxidation aside, as brewchez stated.

Yes you can recarbonate the beer. However 30-35psi at 38° just over night probably won't be enough. Just is not enough surface area and time.

Here's some tips

Full carb in a few minutes. Attach the co2 at x2 psi you desired volume calls for IE 2.4 vol = 10 psi @ 38° so use 20 psi. Lay the keg across your legs, turn the keg so the gas inlet is on the bottom side and rock the keg gently end to end, moving the head space bubble up and down the length of the keg. You can hear the co2 bubbles going in when the slow or stop rock it again. Repeat until the bubbles have stoped or 30min has passed which ever comes first. Release the head pressure and attach for serving at serving pressure.

In the Out, no rocking if using a corny ball lock keg, your white gas coupler will actually fit both in and out ports. So attach the co2 to the out port to allow co2 to enter from the bottom of the keg. This gives the co2 much more exposure to the beer and can carb in 1/2 the normal plug and forget method time. There is even a special lid you can buy that has an airstone tube for this which can carb even faster. This is Not for dumbasses. You must make sure this is the only keg on the co2 manifold or disconnect it when pouring from other attached kegs. The pressure drop from the pour will suck beer into the manifold from the keg attached to the out port.

Plug and Forget Just attach to serving pressure and allow a few days undisturbed to carbonate. This is my preferred method as it does well to clairify the beer too. You can cut this time down by laying the keg on its side so there's less beer depth to saturate through. But laying on side doesn't do well for the beer to clairify.


Overnight at 30PSI probably wasn't enough time to carbonate in the first place. Pouring beer back into the keg may introduce enough oxygen to create some stale flavors. If you plan to drink the beer relatively soon that oxidation/staling may not be enough of a concern, but in time it may get worse.

Check your carbonation level with a pint first. Keep in mind growlers don't always hold carbonation all that well. You have to have a metal cap with a good seal in it. Filling from a growler to go right to an event works, but storing it, even overnight, has never been very successful for me. (You really have to have the right caps.)


Why are you keg conditioning and then bottling into growlers?? As in, is that how you plan to keep the beer or just to take to an event, etc?

I set 24 psi for 48 hours and get perfectly carbonation. If I need to rush, I put on 30 psi for 1 hour, shake the keg for 5 min, 30 psi for 1 hour, shake the keg for 5 min and set to 8 psi to rest. Ready to serve in about an hour. Dont like doing this, but it works. And, it takes about 3 of us to shake a keg for 5 min. Arms gonna fall off after about 30 sec.

  • Shaking it is bad If there is a lot of head space in the keg. For example you can completely foam a 3 gallon batch in a 5 gallon keg. Also like a martini, beer can bruse changing the flavor. Gentle Gentle rocking gets better results imo. Commented Mar 29, 2016 at 18:22
  • Only done this with 5 gal of beer in a 5 gal keg. Never had a bruising issue, but that is something to keep in mind. This is a very dramatic means of carbonating 5 gallons of beer in just a few hours. So, some action is needed.
    – Ryan Whitt
    Commented Mar 29, 2016 at 20:52

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