Sulphite and sorbate are two of the most common wine stabilising products used by home winemakers. They are often used together, but they do different jobs.

Understanding the difference helps you protect your wine, avoid oxidation and safely backsweeten finished batches.

What is sulphite?

Sulphite is commonly added to wine as potassium metabisulphite or sodium metabisulphite. Campden tablets are another common form.

Sulphite helps:

• Protect wine from oxidation
• Reduce spoilage risk
• Limit unwanted bacteria and wild yeast
• Preserve colour and aroma
• Support wine stability during ageing and bottling

Sulphite does not always sterilise wine completely. It is best thought of as a protective winemaking tool rather than a guaranteed way to stop fermentation.

What is potassium sorbate?

Potassium sorbate is used to help prevent yeast from reproducing.

It is most commonly added to finished wine before backsweetening. If you add sugar after fermentation, sorbate helps reduce the chance of the wine fermenting again.

Potassium sorbate does not kill yeast. It does not stop active fermentation. It works best when fermentation is already complete and the wine has been treated with sulphite.

When should sulphite be used?

Sulphite can be used at several stages, depending on your winemaking process:

• When processing fresh fruit or juice
• After fermentation
• During racking
• Before ageing
• Before bottling

The required amount depends on wine pH, style, condition and the product being used. Always follow the label instructions and avoid adding extra sulphite without a reason.

When should sorbate be used?

Use potassium sorbate when:

• Fermentation is complete
• You plan to backsweeten wine
• You want to reduce the risk of renewed fermentation in bottle

Do not use sorbate as a replacement for good sanitation, stable fermentation or sulphite protection.

Why use sulphite and sorbate together?

The two products complement each other.

Sulphite helps protect the wine against oxidation and spoilage organisms. Sorbate helps prevent surviving yeast from multiplying after sugar is added.

For backsweetened still wine, using both gives you much better protection than using one alone.

Wine Stabilising Products

Common mistakes to avoid

Adding sorbate before fermentation is complete

Sorbate does not stop active yeast. Adding it too early can lead to poor results and unwanted flavours.

Using too much sulphite

Too much sulphite can create harsh aromas and make wine unpleasant to drink. Measure carefully.

Skipping sanitation

Sulphite and sorbate are not substitutes for cleaning and sanitising equipment.

Bottling immediately after adding sugar

After backsweetening, wait and confirm the wine remains stable before bottling.

Frequently asked questions

Are Campden tablets the same as potassium sorbate?

No. Campden tablets are a sulphite source. Potassium sorbate is used to prevent yeast reproduction.

Can I use potassium sorbate in dry wine?

You can, but it is usually unnecessary unless you plan to add sugar or another fermentable ingredient after fermentation.

Does sulphite affect wine flavour?

At correct levels, sulphite is usually not noticeable. Excessive use can create unpleasant aromas or flavours.