Making Wine Without Sulfites

A Wine Made Without SulfitesI have a sister who has a serious bronchial reaction to drinking wine made with sulfite. I have a neighbor who’s making wine without sulfites to kill the yeast at the end. He simply waits until it dies of starvation. My sister has no reaction to his wine. I have discovered that boiling the must before starting the yeast without using sulfite is sufficient to start the process. Now I would like to find a method of killing the yeast when I want to stop the process. I thought perhaps I could use a high temperature to kill the yeast at the end, but I don’t know how high that temperature would have to be. Can you help me?

Name: Frits D.
State: Arkansas
Hello Frits,

There seems to be a little bit of confusion. The reason that sulfites are added to any wine after the fermentation is to keep the wine from spoiling – to keep it fresh – not stop a fermentation. A fermentation should run its course until the sugars are all gone, starvation as you say. Sulfites can slow a domesticated wine yeast, but it can not consistently stop it completely, and therefor is not dependable for this purpose.

With that being said, making wine without sulfites is simple. The hard part is keeping the wine from degrading or spoiling after it has been made.

To start off the fermentation, I do not recommend boiling the juice or wine must. When you heat a juice you are promoting oxidation. This can cause the wine to turn color, usually orange or brown. It can also affect the wine’s flavor by adding a caramel to raisin note to it.

The one time I think you should add sulfites is before the fermentation — even if you are making wine without sulfites. Any free sulfite that is in the wine at this point will be long gone by the time the fermentation has completed. The sulfite will readily dissipate as a gas. Why not take advantage of that fact?Shop Wine Kits

This applies to making wine from fresh fruits and juices. If you are making wine from a juice concentrate, then no treatment or sulfite is required at all. For this reason, you may want to consider taking this avenue. Currently, we have over 200 different juice concentrates to choose from.

As for keeping the wine from spoiling after the fermentation, one solution is to always keep the wine refrigerated. It’s simple and effective. The bad part is you need to dedicate most, or all, of a refrigerator to this method. This is one reason why hardly anyone is making wine without sulfites.

A second option that will significantly reduce the risk of spoilage is filtering the wine with ultra-fine filtration. This mean filtering down to 0.5 microns. This is a lot finer than letting the wine drip through a coffee filter. That would only be 20 to 25 microns. Filtering down to 0.5 microns requires the use of an actual wine filter, one that can force the wine under pressure through extremely fine pads. You are literally filtering out over 99% of the wine yeast along with mold spores and bacteria.

The MiniJet wine filter would be the way to go for this purpose. It is important to realize that before using any wine filter, the wine should be finished dropping out sediment, naturally. It should look visually clear before filtering.

Shop Mini Jet Wine FilterAlso, keep in mind that you will want to be vigilant towards keeping the winemaking area sanitary. All the equipment and anything else that comes into contact with the wine needs to be as clean and sterile as possible. There are a whole host of cleansers and sanitizers you can use to do this safely. This is a critical part to making wine without sulfites.

As a final note, there is no such thing as making a wine without any sulfites at all. In part, because sulfite is actually produced during the fermentation. It’s a natural byproduct of the fermentation. The best you can do is to keep the sulfites to a level low. You can expect to see a fermentation produce a wine with 10 to 15 PPM (parts-per-million). When adding sulfites as normally directed the wine will end up with 50 to 75 PPM.

As you can see, making wine wine without sulfites can be easily done. It’s the extra care that needs to be taken to keep the wine fresh and free from spoilage that makes it difficult. But, if you are willing to be sanitary, filter the wine and/or store the wine under refrigeration… it can be done!

I hope this information helps you out.

Happy Winemaking,
Ed Kraus
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.

3 thoughts on “Making Wine Without Sulfites

  1. This information was very helpful and reassuring. We have been making sulfite free (or low sulfite, if you prefer) wine for 7 years now. I use sulfite at crush time to kill off the wild yeast; then add my own yeast the following day. Once fermentation is complete, everything is kept as sterile as possible. We use vodka to sterilize anything that comes in contact with the wine. Also, we use only Organicide on our vines to prevent mildew and insect damage. We prune and thin to get yearly yields of about 350 gallons (Cabernet, merlot, and Chardonnay). We have not had a bad batch of wine yet; but we keep our wine at a constant 55-60 degrees, and usually consume it within 2 years.

  2. Ed,
    What research, if any, are you aware of killing yeast by freezing and what effect would it have on flavor and longevity of the wine?
    I ask because I like a semi-sweet wine (5 brix or 1.012 SG) and had a bottle explode in storage 30 years ago when I first started making wine (Nobody was around and I managed to safely decork the rest of the batch). Because of that I have made high alcohol wines since aiming for the alcohol threshold of the yeast adding sugar sparingly so I don’t get stuck with over sweet wine.
    Most of my wine is drank as a nightcap for health reasons but on occasion I’d like to share a few glasses with company without inebriation being a factor. If there is a way to take part of a batch (I generally make 12-13 gal. batches) before the alcohol gets too high and cold treat it then sweeten it before aging without fear of explosion I’d try it.
    I thought of using a yeast with a lower alcohol tolerance but then I’m going to have a completely different profile and a lot of it if I don’t really like it.

    • Michael, i am sorry, freezing the wine would change the flavor of the wine dramatically and not in a good way. We do not recommend doing so. The only way to avoid a re-fermentation after you back sweeten a wine is to treat it with potassium sorbate. After the fermentation completes, the wine is clear and ready to bottle you will add the potassium sorbate and sweeten to your taste. The article posted below will discuss this in more detail.

      Making Sweet Wine

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