Potassium Metabisulfite

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Product Overview

Potassium Metabisulfite is used to preserve and stabilize a multitude of fermented beverages. It forms sulfur dioxide (SO2) when added to wine preventing oxidation. It also stops wild organisms from developing. It can also be used as a sanitizer (no rinse).

*Usage: Dosage varies, but 1/4 teaspoon of potassium metabisulfite per 5 gallon batch = 50 ppm of free SO2. To use as a sanitizer; Mix 8 teaspoons into 1 gallon of water then apply, clean, and rinse with cold water.

General Info

  • Used to Preserve/Stabilize Wines, Ciders, and Beers
  • Prevents Oxidation
  • Stops Unwanted Organisms from Growing
  • Used as a Sanitizing Agent (No Rinse)

  • Potassium Metabisulfite is to be used in wine making to inhibit bacteria growth, too high a dose will leave an unpleasant taste. 
  • Add 1/4 tsp. per 5 gallons before fermentationfor 50 ppm (wait 24 hours to add yeast) and another 1/4 tsp. per 5 gallons before bottling wine (wait minimum 3-4 days to bottle).
  • An equipment sanitizing solution can be made by adding 1 Tbsp to 1/2 gallon of water (requires rinsing after). 
  • Potassium Metabisulfite is preferred to Sodium Metabilsulfite as it does not add sodium. 
  • Using granular form of Potassium Metabisulfite requires 3/8 of a teaspoon to equal 5 Campden Tablets which will treat 5 gallons of wine to approximate 75 ppm of Free SO2.
  • CAUTION - This chemical can cause an allergic reaction in some people, sometimes a severe reaction.


Potassium Metabisulfite 4 oz Use as a sanitizer in wine making - mix 2 oz (3 tablespoons) per gallon.  Also used to sanitize must and as an anit-oxident. 1/8 tsp / gallon = approx. 100 ppm free SO2 Superior in several ways to sodium metabisulfite. Potassium Metabisulfite, (often referred to as "SO2", "sulfites" "meta", or "meta-bi") has several uses in winemaking. At the crush, sulfites are generally used to help control the spoilage bacteria and indigenous yeast that may already be present both on the fruit and in the winery (i.e. on the picking bins, processing equipment, tanks, tubing, etc). The amount generally used is enough to inhibit most of the unwanted organisms but not enough to hinder a cultured yeast, which has a higher tolerance to sulfites than most of the indigenous organisms do. This inhibition effectively "wipes the slate clean" for the cultured yeast to step in and rapidly colonize the must so that it can effectively dominate the subsequent fermentation. In addition, sulfites also help to inhibit the enzymatic browning of both musts and finished wines so that all of their delicate complexities can be preserved. Later, during storage and in the bottle, sulfites at the proper levels will further protect a wine by continuing to inhibit spoilage organisms, as well as by scavenging oxygen. Note that the exact amount needed to effectively do the job is determined by the pH of the wine. One of the winemaking books that we offer for a complete explanation on how to properly manage sulfites. In addition, it's important to keep in mind that free SO2 levels fall faster in wood cooperage than in glass or stainless, so if you are using a barrel you will most likely need to manage sulfite levels more closely. The most common form of Metabisulfite is as a powder which is fixed with potassium or sodium. 1/4 tsp of Potassium Metabisulfite adds 50ppm to 5 gallons of must. Old Metabisulfite loses potency with time and should be replaced every year to assure that you are getting correct levels. You can use old Metabisulfite to make solutions for sanitizing equipment.


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