Are there any disadvantages to leaving a diffuser stone (0.5micron) in the keg for serving? The one I had bought is attached to a replacement SS dip tube and permanently in the keg.

My option would be to transfer to a new keg after carbonation, but... extra cleaning/sani/time/effort and chance of O2/contam. In other words, if it's not a big factor, and the stone will still bubble gas up to the headspace for serving, I won't bother.

To take that further, after I get my carb to the desired volume using temp chart, wetting psi, atmospheric, and elevation, do I leave gas at that setting or lower it to regular chart pressure to just push out the beer at that CO2 volume?

1 Answer 1


Serving using a submerged carbonation stone is less than ideal.

It will stir up sediment that's usually undisturbed on the bottom of the keg.

Also the sudden burst of cO2 will cause head foam in the keg. Cleaning that dried lacing from the keg won't be fun.

I've never seen one that attaches directly to the normal gas port. Ideally the stones are attached to a custom lid with its own port. So when ready to serve you change the lid or just attach cO2 to the standard gas port.

If your stone attaches to the normal gas port and is on a short tube so that it's indented for the keg to be inverted while carbonating. But isn't in the beer while upright, then it wount have any issues.

Second question: Your serving system should pour at the same pressure used to carbonate most beer styles so the cO2 volumes don't change while it's on tap. Line size and length are critical.

  • I bought it from one of the big online stores, however, the item has since been replaced with the hose/lid style. The thin SS tube goes up through the normal Gas dip tube and attaches at the top. It looks like it is the same part as an O2 wand. In order to disassemble, I have to begin by removing the post... This would obviously make it hard with a full keg.
    – Stevo
    Jan 8, 2018 at 15:23
  • @Stevo Cheap solution: Cut it as short as possible and carbonate with the keg inverted. Jan 8, 2018 at 15:27
  • Cut short and invert--Perfect!!! Now, after carb and right side up, the stone will not be in solution. Should I subtract wetting psi for serving or leave it alone?
    – Stevo
    Jan 8, 2018 at 17:14
  • @Stevo I don't know what "wetting psi" is. I would just slow carb at a constant psi for a few days rather than high for short time Jan 8, 2018 at 17:34
  • 1
    Middle of page 1 (starts para 9) and page two describe. chme.nmsu.edu/files/2016/06/Brite-tank-carbonation.pdf
    – Stevo
    Jan 11, 2018 at 20:18

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