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Degassing Homemade Wine

Posted on January 10, 2011 by Ed Kraus There have been 24 comment(s)

CO2 GasAt the very center of wine making is the process of fermentation. Fermentation occurs because the yeast want to consume the sugars in a wine must. As a result the sugars are converted into both alcohol and CO2 gas by the fermentation. Normally as winemakers, we are concerned about the alcohol, but in this post we are going to change directions and talk a little about the gas.

Almost all of the CO2 produced during a fermentation dissipates into the air and goes away very quickly, but not all of it. Any liquid, wine included, has the ability to hold some CO2 gas for a period of time. This CO2 gas is the same stuff that puts the fizzy in soda pop, beer and even the sparkle in champagne, but when it comes to wine we don't want CO2 gas to do anything but be gone.

A Little Degassing Background
When I first started making wine, degassing was not even a word in the winemaker's vocabulary. Finished homemade wines always sat around long enough in bulk glass jugs before bottling, that they degassed themselves naturally. Wines back then needed extra time to clear, and along with this time the wine was able to release all the CO2 gas it contained.

But things changed when 28 day and 6 week wine kits came onto the scene. These kits allowed the home winemaker to bottle their wines in just 28 days. This is not enough time for the CO2 gas to escape on its own. Because of this, the wine kit producers added the extra step of degassing in their homemade wine instructions.

How Do You Degas A Wine?
A portion of the CO2 gas can stay saturated in a wine indefinitely because the gas molecules will lightly bond with the wine, but by agitating the wine with something as simple as a stirring spoon, the gas molecules will start to release and float to the surface. If you stir the wine long enough, all but an untraceable amount of the CO2 gas will release. This may take a little stirring or a lot, depending on the amount of gas.

One way to speed up the process is to use a degassing/mixing paddle. The paddle attaches to a hand drill just like a drill bit would. This significantly reduces the amount of labor and time needed to degas a wine.

Another one of our, lesser known, wine making tips is to use a wine preserving vacuum pump, like our Vacuvin Wine Saver or any other hand-held wine preservation system to degas the wine. By putting the vacuum pump directly over the air-lock hole of a rubber stopper, you can literally pump the CO2 gas out of a glass jugs or plastic fermenters.
Ed Kraus is a 3rd generation home brewer/winemaker and has been an owner of E. C. Kraus since 1999. He has been helping individuals make better wine and beer for over 25 years.

This post was posted in Wine Making Blog

24 Responses to Degassing Homemade Wine

  • John Thomas
    John Thomas says:

    I've been stirring my wine for 4 days now, 4 to 5 times a day for about a minute and I still have foam or bubbles. Do I just keep this process up until there are no bubbles or did I screw up somewhere?

    Posted on December 7, 2011 at 6:35 am

  • Customer Service
    Customer Service says:

    There is not reason to wait between degassing periods. Just keep stirring until no more bubbles are releasing. It is important to understand that if you splash the wine while stirring, you will saturate some air into the wine. This will cause bubbling/foaming as well. So I would look closely to see if this is now the cause of the bubbles. Something else that is not mentioned in the above article is that the colder the liquid the tighter the bond between the CO2 and the wine. If your wine is very cold the could be the reason that your wine is reluctantly giving up the CO2. Temporarily warm the wine up ito 70F if this is the case.

    Posted on December 7, 2011 at 8:30 am

  • Mindy
    Mindy says:

    how would you recommend warming it up? Ours it taking hours..and I'm pretty sure its because the temp of the wine is much lower than when we started. I dont know any room in our house that is 72 or higher.

    Posted on March 27, 2012 at 10:06 pm

  • Customer Service
    Customer Service says:

    Please don't misunderstand our previous comment about temperature. You do not want the wine warm or hot. You just don't want it cold.

    Posted on March 28, 2012 at 6:39 am

  • Tom
    Tom says:

    Does it help to pour the wine from one container to another to degas it?Thnxx

    Posted on July 11, 2012 at 12:55 am

  • Customer Service
    Customer Service says:

    Tom, this is a great question. You could pour the wine back and forth and it would release the CO2 from the wine, but it would also introduce excessive oxygen into the wine. This will cause the wine to eventually oxidize. If you have done this already, I would recommend adding a dose of metabisulfite to the wine to help drive out some of the oxygen. The goal with degassing is to agitate the wine without splashing. It is the splashing that allows air to saturate into the wine.

    Posted on July 11, 2012 at 9:55 am

  • Ray Hammond
    Ray Hammond says:

    Hello, I use your kits however am in no hurry to bottle preferring at least six months of age time. After initial fermentation in a six gallon plastic bucket, I transfer to glass carbouys. I then pour into a fresh carbouy at about a month to get the wine off the sediment. How can I transfer off the sediment again at three months and degas without adding oxygen? And why is oxygen so bad? What are the effects to the wine? My prefernece is not to add sulfites. Please advise. Thank you.

    Ray Hammond

    Posted on September 4, 2012 at 9:13 am

  • Customer Service
    Customer Service says:

    Ray, the reason oxygen is so bad is because it oxidizes the wine. Like an apple that's been bit will turn brown, a wine will turn brown as well. I would suggest getting a degassing/mixing paddle. This will allow you to degas without getting too much air into the wine. I understand that you do not want to use sulfites in your wine. Please realize that not doing so will shorten the life of your wine. You might want to take a look at the article "Controlling Oxidation When Making Wine" that is listed on this blog:

    Posted on September 4, 2012 at 10:27 am

  • matty
    matty says:

    I have made wine from fresh grapes about 500lb,this past spring (california grapes),and now I am at the scond fermantations .for some reason in one of the 5gal, bottle there is a white residue on the top of the wine. can you tell me what could it be? thank you, Matty.

    Posted on November 25, 2012 at 4:28 pm

  • Customer Service
    Customer Service says:

    Matty, it's hard to know for sure without seeing it, but most likely it is a bacterial infection of some kind. This can easily be stopped by a dosing of sulfites. If you have not add sulfites to your other vessels, I would recommend that as well.

    Posted on November 26, 2012 at 6:24 am

  • hans
    hans says:

    Dear Ed,

    As you said the process of degassing is not necessary in "normal" wine making. Can this step be avoided by using another yeast?

    I found that even after 9 months the CO2 is still in the wine so I am wondering what is causing this.

    Best regards,


    Posted on December 17, 2012 at 4:20 am

  • Customer Service
    Customer Service says:

    Hans, regardless of the wine yeast you use the CO2 given off will be just about identical. The variation is only 2% or 3% with these yeast.

    Posted on December 17, 2012 at 6:18 am

  • Hans
    Hans says:

    Dear Ed,

    Perhaps I should rephrase my question. I do not understand why the CO2 does not leave the wine by itself even after a long time. Is that related to the concentrated juice or is it related to the yeast?

    I am hoping that by using a different yeast the CO2 will leave the wine as in normal wine making. I do not need a yeast that can ferment 5 gallons in 6 days. I can wait a bit longer.

    Thank you.

    Best regards,


    Posted on December 17, 2012 at 7:01 am

  • Customer Service
    Customer Service says:

    Hans, the CO2 that remains in your wine has nothing to do with which yeast you use or concentrate verses fresh juice. Not all CO2 wants to leave wine naturally. Some of it will stay if left alone. 'How much' depends on temperature of the liquid. The cooler your wine is the more CO2 gas will want to stay in the wine. This is true of any liquid.

    Posted on December 17, 2012 at 8:25 am

  • michael baluch
    michael baluch says:

    Dear Ed,

    In the middle of October I started twenty-five gallons of concord wine from juice. The only thing I added was one pound of sugar per gal. and 1 tsp. of nutrient per gal. Two months later it still looks like it's going through its secondary, (natural) fermentation. My question is, should I now end the MLF by sulfiting and racking the wine or should I just wait it out?

    Posted on December 20, 2012 at 3:49 pm

  • Customer Service
    Customer Service says:

    If the wine is sitting on any sediment I would rack it off of it into a clean fermenter, but other than that your best off to leave the wine be.

    Posted on December 21, 2012 at 2:53 pm

  • Farmboy
    Farmboy says:

    I have been making wine off and on for 30 years and have never degassed . I just let my wine age in the carboy 4 to 6 months before bottling . Also , the only additive in the kit I use is the yeast , and sometimes the sulpate if I intend to keep the wine more than a year or two. All the other stuff is unnecessary if you age your wine properly.

    I find the wine has a sweeter,purer taste without the sulphate.

    Posted on February 4, 2013 at 7:43 am

  • Tom Johansson
    Tom Johansson says:

    Thanks Ed. Probably just what I needed to know. Very informative. I have a beery wine that wont stop "gasing". have stired it several times with is drill and wisk and use a Vaccum pump in the mean time but the gas just keep producing. Temp has perhaps been a bit cold, about 19-20 C and I will ad a pinch Metabisulphite. Any other suggestions will be greatly appreciated. //tj

    Posted on November 17, 2013 at 1:58 pm

  • Customer Service
    Customer Service says:

    Tom, before adding the sulfite, I would check the wine with a hydrometer to see if the fermentation ever finished with the sugars. You could have a lingering fermentation. If this is not the case, it is possible that the case is the result of a bacterial infection. In which case the addition of sulfites will remedy very easily and quickly.

    Posted on November 18, 2013 at 7:03 am

  • Tom Johansson
    Tom Johansson says:

    Thanks. I actually had done what you suggested and found the fermentation slowly restarting. A small decreace in the I also added a heating pad and some sulphite. It is still gasing, perhaps a bit less. Bacterial infection, i suppose it will eventually kill the batch..

    It is a 23 l batch, how much sulphite do you suggest I should add?

    Posted on November 22, 2013 at 12:58 pm

  • Customer Service
    Customer Service says:

    Tom, we recommend 1/16 teaspoon to each U.S. Gallon, That comes out to three 1/8th teaspoons to 23 liters.

    Posted on November 23, 2013 at 7:39 am

  • Tom Johansson
    Tom Johansson says:

    Thanks again Ed. I think that should be 3/8's tsp. 23l = 6 US gall. which is about what I added.

    I racked it again before adding the sulphite but it is still gassing pretty good. I dont want to loose this batch, it's nice hand picked Saskatoon's. You may call them bearberries, Juneberries??

    Posted on November 24, 2013 at 2:08 pm

  • ted grudzinski
    ted grudzinski says:

    When is the time to de-gas wine. I have made wines from, bananas, bananas and peaches, grapes... I left them sit after racking to bulk age until I need the carboys for the next years batch. But my bottled wines are definitely carrying over too much CO2. So when in the process should I de-gas them. I have a de-gassing wipe. Kits tell me when to do it.

    Posted on August 18, 2014 at 10:30 am

  • Customer Service
    Customer Service says:

    Ted, if you are bulk aging your wine then I would suggest that you wait to degas when you are ready to bottle the wine. Rack the wine off the sediment; degas the wine; add sulfites; and bottle. It is important to rack off the sediment first. It is also important to degas before adding any sulfites to the wine such as potassium metabisulfite.

    Posted on August 19, 2014 at 6:28 am