Types of SO2


Types of SO2  
We recommend SO2 in 2 specific forms for addition to your wine, Potassium Metabisulfite (most common) and Efferbaktol (our favorite). Potassium Metabisulfite is often shortened to “meta” “SO2” “Sulfite”, and comes in a white powder form.  It can be dissolved into water and added to the must or finished wine. Our preferred format for sulfite is in the form of effervescent self-dissolving granules called Efferbaktol.  SO2 is also available from Campden tablets, which look like aspirin. Campden tablets are made from Sodium Metabisulfite, a less desirable form of SO2.   However, they're easily measurable in small doses.  
Efferbaktol packets:  
Sizes: Available in 2g (AD503A) and 5g (AD504A) packets.  
2g adds 528ppm per gallon and 5g adds 1320ppm per gallon.
To add the right amount of SO2 for your fermenter using Efferbaktol, divide the ppm by your gallons of must to see how many ppm of SO2 will be added:  
Let's say you have 10 gallons of must. The 2g packet offers 528ppm per gallon; divide 528ppm by 10 gallons to get 52.8ppm, close enough to our desired 50 ppm. To use: Tear the bag open and add directly to the must or wine. Mix thoroughly. Easy and clean.  
About Efferbaktol: It takes 2.5 grams of product weight to give 1 gram of SO2. So, the 2 gram packet of Efferbaktol actually weighs 5 grams. This is useful to remember when dividing dosages between vessels while using a scale. If the individual dosages are done at the same time, this is not a problem. Once opened, you should quickly use the entire contents of the package because it begins to lose its effectiveness when exposed to moisture in the ambient air.  
SO2 in Powdered Form:  
Sizes: Available in 4oz (AD495), or 1lb (AD500) bags  
0.33 grams per gallon results in 50ppm. For 10 gallons you would need 3.3 grams of powdered meta-bisulfite. If you do not have a gram scale, ½ teaspoon (level) is about 3.3 grams and adds 50ppm (“total”) to 10 gallons. To use: Dilute the sulfite powder in water or juice until the crystals are completely dissolved and thoroughly mix into the must.

For more comprehensive information on SO2, see our Guide to SO2 Management.

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