If you've spent any time looking at wine, cider or country wine recipes, you've almost certainly come across Campden tablets.
They're one of the most commonly used products in home winemaking, yet they're also one of the most misunderstood.
Ask ten beginner winemakers what Campden tablets do and you'll often get ten different answers.
Some believe they're used to sterilise equipment. Others think they stop fermentation completely. Some assume they're only needed for wine and have no place in cider making.
The truth is a little more complicated.
Campden tablets can be used for several different purposes throughout the winemaking and cidermaking process, from preparing ingredients before fermentation to protecting the finished drink during storage.
Understanding when and why to use them can help improve the quality, stability and shelf life of your homemade wine or cider.
In this guide we'll explain exactly what Campden tablets are, what they do, when to use them and some of the common mistakes beginners make.
What Are Campden Tablets?
Campden tablets are small tablets made from either sodium metabisulphite or potassium metabisulphite.
When dissolved, they release sulphur dioxide (SO₂), a compound widely used in commercial and home winemaking.
While that might sound intimidating, sulphur dioxide performs several important functions that help protect wine and cider throughout the production process.
For decades, Campden tablets have been a staple ingredient for home winemakers because they're simple to use, inexpensive and highly effective when used correctly. We stock a Campden Tablets 50 Pack and a Campden Tablets 100 Pack — the larger pack is better value if you brew regularly.
You'll find them recommended in recipes for:
- Fruit wines
- Country wines
- Cider
- Mead
- Some beer brewing applications
Despite their widespread use, Campden tablets are not a substitute for good cleaning and sanitation practices. Instead, they're best thought of as an additional layer of protection for your wine or cider.
Why Do Homebrewers Use Campden Tablets?
Campden tablets are popular because they perform several different jobs depending on when they're added.
The most common uses include:
- Removing chlorine and chloramine from water
- Helping suppress unwanted wild yeast and bacteria
- Protecting wine and cider from oxidation
- Stabilising wine before bottling
- Helping preserve flavour and aroma during storage
Not every homebrew recipe requires Campden tablets, but many experienced winemakers consider them an essential part of producing consistent results.
The key is understanding which job you're trying to achieve before adding them.
Removing Chlorine and Chloramine From Brewing Water
One of the most overlooked uses for Campden tablets is water treatment.
Many UK water supplies contain chlorine or chloramine to keep drinking water safe. While these chemicals are perfectly fine for drinking, they can create problems when making beer, wine or cider.
In particular, chlorine can react with compounds during fermentation and produce unpleasant medicinal or plastic-like flavours.
Fortunately, Campden tablets provide a simple solution.
A small amount added to brewing water can neutralise chlorine and chloramine before fermentation begins, helping create a cleaner-tasting finished drink.
For many homebrewers, this is one of the easiest improvements they can make to their brewing process.
Protecting Wine and Cider From Oxidation
Oxygen is both friend and enemy in homebrewing.
Yeast needs oxygen at the start of fermentation, but once fermentation is complete, excessive oxygen exposure can quickly damage wine and cider.
Oxidation can cause:
- Loss of fresh fruit flavours
- Dull aromas
- Colour changes
- Shorter shelf life
- Stale or sherry-like flavours
Campden tablets help protect against oxidation by releasing sulphur dioxide, which acts as an antioxidant.
This is one of the reasons many winemakers add a Campden tablet when racking wine from one demijohn to another.
The small amount of protection can make a noticeable difference during long maturation periods.
Suppressing Wild Yeast and Bacteria
When making country wines, fruit wines or cider from fresh ingredients, you're not just collecting fruit or flowers.
You're also collecting naturally occurring wild yeast and bacteria.
Some of these microorganisms are harmless. Others can cause off-flavours, spoilage or fermentation problems.
This is where Campden tablets are often used before fermentation begins.
Many traditional recipes recommend crushing a Campden tablet and adding it to the must or juice before pitching cultured yeast.
The sulphur dioxide helps suppress unwanted microorganisms, allowing the selected wine yeast to take control of fermentation.
This can lead to more predictable and consistent results.
Using Campden Tablets in Wine Making
Wine making is where Campden tablets are most commonly used.
You'll often find them included in recipes for:
Depending on the recipe, Campden tablets may be added before fermentation, after fermentation or during ageing.
For example, many elderflower wine recipes recommend adding a Campden tablet after racking to help protect the wine during maturation.
This is particularly useful for wines that may spend several months ageing before bottling.
Using Campden Tablets in Cider Making
Campden tablets are also widely used in cider making.
If you're making cider from fresh pressed apple juice, a Campden tablet can help suppress wild microorganisms before fermentation begins.
Many cidermakers also use Campden tablets when stabilising cider prior to back-sweetening.
This helps reduce the risk of renewed fermentation once additional sugars are introduced.
If you're using a modern cider kit, follow the manufacturer's instructions, as many kits are designed to work without additional sulphite additions during primary fermentation.
Do Campden Tablets Stop Fermentation?
This is probably the biggest misconception surrounding Campden tablets.
The short answer is no.
Campden tablets do not normally stop an active fermentation on their own.
Once a healthy yeast population is actively fermenting, the amount of sulphite provided by a typical Campden tablet addition is usually insufficient to completely halt fermentation.
This often catches beginners out.
They add a Campden tablet expecting fermentation to stop immediately, only to find the yeast continues working.
When winemakers want to stabilise a wine before sweetening, Campden tablets are often used alongside other stabilising agents such as potassium sorbate.
Together they help reduce the risk of fermentation restarting after bottling.
If you're planning to sweeten a finished wine or cider, it's important to understand that Campden tablets alone are rarely enough.
How Many Campden Tablets Should You Use?
The correct dosage depends on what you're trying to achieve and the volume of liquid being treated.
Different recipes and manufacturers may recommend slightly different rates, so always follow the instructions supplied with your recipe or product.
Using more is not necessarily better.
Excessive sulphite additions can affect flavour and aroma, while also creating unnecessary complications during fermentation.
As with many aspects of homebrewing, accuracy tends to produce better results than guesswork.
Common Campden Tablet Mistakes
Adding Too Many
One of the most common mistakes beginners make is assuming that if one tablet is good, two or three must be better.
Overdosing can leave excessive sulphite levels in the wine or cider and may negatively affect flavour.
Pitching Yeast Too Soon
When Campden tablets are used to suppress wild yeast before fermentation, many recipes recommend waiting before pitching your chosen yeast.
This gives the sulphur dioxide time to do its job and dissipate to a level that won't interfere with fermentation.
Adding wine yeast immediately after a Campden tablet can sometimes slow fermentation or reduce yeast performance.
Using Them Instead of Proper Sanitising
Campden tablets are not a replacement for cleaning and sanitising equipment.
Every fermenter, demijohn, airlock, siphon and spoon should still be properly cleaned before use.
Think of Campden tablets as an additional tool rather than a substitute for good brewing practices.
Assuming They Stop Active Fermentation
As mentioned earlier, Campden tablets are not designed to halt an active fermentation by themselves.
If your goal is stabilisation before sweetening, additional steps may be required depending on the style of drink you're making.
Frequently Asked Questions
Can I make wine without Campden tablets?
Yes.
Many people successfully make wine without using Campden tablets at all.
However, they can provide additional protection against oxidation and spoilage, which is why they're commonly included in traditional recipes.
Do Campden tablets expire?
Campden tablets have a long shelf life when stored correctly, but they do gradually lose effectiveness over time.
If your tablets are several years old, replacing them is usually a sensible precaution.
Can I use Campden tablets in beer?
Yes.
Many brewers use Campden tablets to remove chlorine and chloramine from brewing water before mashing or fermentation.
This is often their primary use in beer brewing.
Are Campden tablets the same as steriliser?
No.
While Campden tablets can help suppress microorganisms, they are not a substitute for a dedicated cleaning and sanitising product.
Proper sanitation remains essential throughout the brewing process.
Final Thoughts
Campden tablets may be small, but they play an important role in many homebrewing recipes.
Whether you're making elderflower wine, fruit wine, cider or treating brewing water, they can help improve consistency and protect your finished drink.
The key is understanding what they actually do.
They aren't magic tablets that solve every brewing problem, nor are they a substitute for good sanitation practices.
Used correctly, however, they can help reduce oxidation, suppress unwanted microorganisms and improve the stability of your wine or cider during ageing.
If you're making wine, cider or country wines at home, they're one of those products worth keeping in the brewing cupboard.
Browse our Campden Tablets 50 Pack or Campden Tablets 100 Pack, explore our Wine Making Supplies and Cider Making Equipment & Supplies to support your next batch.