Sterilizing solution has two uses: sterilizing equipment or sterilizing must. Each one requires a different strength. Each winemaker has his own view on what the proper strength solution to use.
Sterilizing solution for equipment
Soak equipment at least five minutes in sterilizing solution. Put some in a spray bottle to spray things like the hydrometer. Let air dry then use.
1 tbsp potassium metabisulfite weighs 20 g (0.7 oz)
Make a gallon of 1/2% sterilizing solution and keep it sealed in a jug so sulfur dioxide does not evaporate.
- 1 1/2 tbsp. (30 g) potassium metabisulfite
- 1 gallon spring water
This gives 1% SO2
- 2 tsp. potassium metabisulfite
- 1 liter spring water
- 4 tsp. potassium metabisulfite
- 1/2 gallon spring water
Dosage recommended by manufacturer
- 2 oz potassium metabisulfite
- 1 gallon water
Use sterilizing solution or vodka in airlocks instead of water.