I've been having some racking issues lately, I can't seem to get a steady flow through the cane and tubing. Would the bubbles or air gaps that I see in the tubing cause oxidation?

Moving forward, I'm going to get an auto-siphon, but just curious for past brews.

Edit, yes it's definitely air, I cracked the cane recently, so it's getting in through there. Definitely time for a new one, was just wondering how much damage it was causing.

  • FWIW, I have more of the same issues with the autosiphon vs a plain racking can.
    – brewchez
    Commented Jul 18, 2011 at 14:56
  • 2
    Question title sounds like it oughta be an old timey tune :)
    – Tim Holt
    Commented Jul 18, 2011 at 19:21
  • @brewchez: Good to know about the autosiphon, maybe I'll just get a new racking cane.
    – PMV
    Commented Jul 19, 2011 at 0:27
  • I'm new at this and freak out all the time until I start reading posts...my mead is in its second racking. It is tart so naturally I freaked until I read aging and time will eliminate some of that but mead is generally tart to begin with. I can back sweeten but that seems to create a too sweet mead.This second racking was an issue with bubbles in the tube so again I freaked ... All in all, I guess what in saying is that the Egyptians couldn't have had any better mead than what I'm trying to do...lol
    – user8465
    Commented Nov 19, 2014 at 16:26
  • I don't find meads to be tart to 'begin with'.
    – brewchez
    Commented Nov 19, 2014 at 19:02

3 Answers 3


Check all your connections to make sure they are tight. I've had problems at the connection point between the tube and the spigot coming off of the bucket, but the spigot had varying widths as it went up so I just shoved the tube on a little farther and it solved the problem. If you heat the tube up a little in some warm water, it will become more malleable and easier to get a tighter fit.

However, are you sure it is actually air getting into the tube? There is dissolved CO2 in the beer during the racking process, though far less than after the beer has finished carbonating. But it may be enough that when the beer gets pushed through the tube, the CO2 comes out of solution and looks like air getting into the tube.

If it is just CO2, it won't hurt the beer of course. A small amount of O2 probably wouldn't be too noticeable unless you plan to age the beer and really want an purely O2 free environment. Since the beer isn't hot, oxidation takes some time and you will probably ok.


If what you're getting is really air and not CO2, then yes, it can be a real oxidation issue. It's happened to me and I've tasted it in other people's beers. As has already been stated, check your connections to be certain that there are no leaks there. I've found that you can ofter clear the bubbles out of the line by pinching the tubing behind the bubbles, right where the tubing connects to the racking cane. You can also try putting a hose clamp at the tubing/racking cane junction to seal it and prevent air from getting in.

  • 1
    A little keg lube on the cane before slipping on the tubing with a hose clamp definitely works well to stop leakage of air at that joint.
    – brewchez
    Commented Jul 18, 2011 at 18:52
  • Yes! +1 for pinching the tube. It always works for me.
    – Jeff Roe
    Commented Jul 18, 2011 at 19:38

I wouldn't worry about this.

You should probably try and minimize all the leaks in your bottling system, butI don't think this will really affect the quality or longevity of your beer to any great extent. I use a racking cane poked into tube which is not the best fit and I have never experienced off-flavours consistent with oxidation. My (untested) explanation is that not much extra oxygen gets dissoved into the wort, and any that does gets scrubbed out by the CO2 from bottle-conditioning.

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