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I've had a lot of trouble finding a quick and easy answer to this question. Wine makers will add these chemical to wine after fermentation to prevent spoilage, and as an antioxidant. You can also add these two ingredients in mead, cider, wine, and beer to stop fermentation in order to hit a final gravity, or back sweeten.

Without the use of a SO2 meter, what is a good approximation of how much potassium metabisulfite/Potassium Sorbate I should add to stop fermentation?

Measurements in grams/gallon please..

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1 Answer 1

One tablet in one gallon of must yields 150 ppm total sulfur dioxide.

Those instructions are on the bottle of Campden tablets, which are potassium metabisulfite.

Here's a source for Campden tablets.

Generally, Campden tablets are never used in beer, only in wine, mead, and sometimes cider.

Potassium Sorbate also has instructions right on the bottle.

"Potassium sorbate, aka "stabilizer," prevents renewed fermentation in wine that is to be bottled and/or sweetened. Use 1/2 teaspoon per gallon."

Here is a source for Potassium sorbate.

It is my understanding that you use one or the other, either Campden or Potassium sorbate, not both.

Hope that helps.

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You have to add both to stop and prevent fermentation. K-meta kills and the K-sorbate prevent the yeast from reproducing. When added, the gravity will still fall a few points while the process occurs. There is plenty of information out there. Here is one post. fermentarium.com/content/view/165/58 Both can absolutly be added to beer. Especially in beers with high amounts of fruit or honey. Or if you have a stuck fermention and require extreme measures, ie Champagne yeast. I have both chemicals in bulk powder form. I want to know how many grams per gallon to add. –  Tim Weber Dec 23 '09 at 1:59
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As to your questions, the labels to the products I listed above also answer your questions: Potassium sorbate at 1/2 teaspoon per gallon. There is no good way to convert teaspoons to milligrams due to the unknown density of your potassium sorbate. For the potassium metabisulfite, Campden tablets are 550milligrams for 1 gallon, assuming what you have is the same. –  TinCoyote Dec 23 '09 at 5:14
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