Accueil Decision-making tools SO2 tool

SO2 tool

The most active fraction of free SO2 is called active SO2. Active SO2 depends largely on the wine’s free SO2 content and pH. It is this fraction that stabilizes the wine against micro-organisms (Brettanomyces, lactic acid bacteria, acetic acid bacteria, etc.). Free SO2 is interesting for its antioxidant power.

Calculation of active SO2


It is commonly accepted that an active SO2 value of 0.35mg/L in a wine gives it minimum microbiological protection, and that a value of 0.60mg/l gives it maximum microbiological protection.

Calculation of active SO2

Recommendations for your wine

Theoretical state of the wine after sulfiting

Theoretical state of wine after addition of SO2.

The information provided by this tool is for guidance purposes only and reflects our current knowledge of yeast nutrition. This information does not replace the advice of your winemaker, specifically tailored to your situation. The conditions of use of the mentioned products are subject to compliance with current legislation and regulations. As they are beyond your control, Lamothe-Abiet declines all responsibility for the use of this tool.

result