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How much metabisulphite to add to a 225-litre barrel

For a 225 L barrel at pH 3.3 and 15 mg/L of free SO₂, to reach 35 mg/L you need about 8 g of potassium metabisulphite (78 mL of a 10 % solution).

Parameters

Result

Approximate calculation using a simplified model: for designing equipment and process modes, consult a technologist.

Calculation example

Wine volume
225 l
Wine pH
3,30
Free SO₂ now
15 mg/L
What is known
I know how much free SO₂ is needed
Required free SO₂
35 mg/L
Potassium metabisulphite to add
7,8 g
SO₂ to add
20,0 mg/L
That is of a 10 % metabisulphite solution
78 ml
Free SO₂ after the addition
35,0 mg/L
Molecular SO₂ after the addition
1,10 mg/L
Share of active SO₂
3,1 %

Frequently asked questions

How to add the solution to a barrel?
The solution is mixed into a small amount of wine and gently stirred in the barrel so that the SO₂ is distributed evenly.

The calculations are approximate: they help to assess the process and compare options, but do not replace a process design and trials on a specific raw material. This section is for reference only and contains no commercial offers.