Potassium metabisulfite dosage for mead: 50-100 ppm
Potassium metabisulfite is added to mead at 50-100 ppm to inhibit unwanted microorganisms and prevent oxidation. This typically translates to 0.15-0.3 grams per gallon (3.8 L) of must. For stabilization before backsweetening, use 0.15 g/gal; for long-term storage, use 0.3 g/gal. Always dissolve in a small amount of water before adding to the must.
Potassium metabisulfite dosing chart
| Purpose | ppm | Grams per gallon | Teaspoons per gallon |
|---|---|---|---|
| Initial stabilization | 50 | 0.15 | 0.05 |
| Standard protection | 75 | 0.23 | 0.08 |
| Long-term storage | 100 | 0.30 | 0.10 |
Application methods
- Direct addition: Dissolve powder in 1/4 cup warm water, then mix into must
- Campden tablets: One tablet contains ~0.44 g; use 1/3 tablet per gallon for 50 ppm
- Timing: Add after fermentation completes and must is below 70°F (21°C)
Safety considerations
- Wear gloves and eye protection when handling
- Avoid inhaling powder
- Label containers clearly
- Keep away from acids (releases sulfur dioxide gas)