Jeff Branco
San Francisco, CA

Winery Equipment Testimonial

Ryan and I worked together at Justin Winery for five years and have known each other for ten. While at Justin, Ryan was passionately interested in the wine making process, could fix about anything and was totally dedicated to making the winery a success. He has taken that dedication to Vintner Vault and became a major player in the winery supply business in just a few years. Jeff Branco, former VP and Winemaker Justin Winery

So2 Additions

The 10% Solution
A much better way to get your SO2 is from a 10% solution of potassium metabisulphite in water. For instance, you could add water to 1 pound of potassium metabisulphite to make a total volume of 1 imperial gallon. Or, if you prefer metric, add enough water to 100 grams of potassium metabisulphite to make up a total volume of 1.00 litres. Fresh 10% solution is 5.7% SO2.
A commonly used unit of measurement for SO2 in must or wine is “parts per million” or “ppm”. 1 ppm is the same as 1 milligram per litre. I will use ppm.
For example, if you add 2.4 millilitres of 10% potassium metabisulphite solution to 1.0 imperial gallons of wine you will be adding 30 ppm SO2. If you have a 19.2 litre carboy to which you wish to add 20 ppm SO2, multiply 0.35 by 19.2 to get an SO2 addition of 6.7 mL of 10% solution. Consider making up your own spreadsheet giving SO2 additions for your own sizes of barrels and carboys.
For SO2 Additions Using a 6% SO2 Solution
1/3 of the so2 will combine instantly in any wine that is not sterile filtered.
Formula Is
Number of Parts Required Multiplied by 3 then divided by 2 (This will adjust for the 1/3 which will combine.)
Divide this number by 1000 then multiply by 3.785.
This will give you the addition in Liters for a single barrel.
If you were adding 20 parts to a barrel
20 * 3 / 2 / 1000 * 3.785 = 0.11355 or 113 ML per barrel to increase the SO2 by 20 Parts
To make this addition to a tank you would multiply the 0.11355 by the number of gallons then divide by 60
0.11355 * 500/60 = 0.94625 or 946 ML


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