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Wine Making FAQs

A high % of winemaking and beer making failures can be traced to lapse in cleaning and sterilisation.

Cleaning means removing visible dirt and residue from your equipment, sterilising means treating your equipment with a chemical that will eliminate or prevent the growth of spoilage organisms.

Everything that comes into contact with your wine or beer must be clean and properly sterilised. This means your fermenting vessel, but also syphon’s, airlocks, bungs, thermometers and hydrometers.

Remember that one single lapse could result in a failure for your beer or wine.

Sometimes fermentation stops prematurely. This is referred to as a ‘stuck’ ferment. There are different reasons why this might occur.

The suggested method of re-starting a wine is by breaking down the wine ‘must’.

*Sterilise a Demi-John
*Fill the Demi-John up to no more than half way with wine from the bulk
*Add a small amount of yeast nutrient
*Add good re-start yeast
*Put the Demi-John in a warm place
*When fermentation is well underway top up gradually to the gallon with wine from the bulk
*Continue this way until all of the wine is fermenting

Remember that a combination of grape juice/sugar/water will produce fermentation, provided that the yeast used is viable. If fermentation is not evident or has started and ceased prematurely this is not the fault of the wine kit. The cause could be down either to the ‘winemaking skills’ of the maker or the environment in which the wine is being made.

When fermentation is not apparent do not assume that the wine is not fermenting. Taking SG readings over a period of perhaps 24 hours will either confirm your suspicions or show that fermentation is underway.

The wine might have a bacterial infection due to the improper sterilisation of your equipment. It is important that everything that is exposed to the wine is sterilised well.

Young’s steriliser is specially formulated to do the job. All equipment should be periodically replaced.

The wine might taste yeasty, it needs time to mature.

The wine has a smell of carbon dioxide gas. This is one of the gases produced during the fermentation process and is why de gassing is very important once fermentation is complete.

The more gas removed the wine will be cleaner and crispier tasting.

The wine tastes musty. It is probable that the wine has been left too long on the lee’s (debris) at the end of fermentation. Rack it off the sediment once fermentation is complete. Once it has cleared, bottle it.

The wine tastes like water from the swimming pool. This is cork infection and the wine needs discarding.

The taste / smell of pear drop, vinegar or tarty? Usually indicates that the wine has acetified. Alcohol has been converted into acetic acid due to bacterial contamination.

Kit wines are usually easier to clear than wines made from fresh ingredients where there are more ‘specific’ factors, which influence the clearing.

All wines will clear naturally given time and it is important that we do give them time. However, for a wine to clear the following conditions must apply:

1. The wine must have stopped fermenting.
2. The wine must be free from bacterial contamination.
3. The wine must be in the right environment.

The addition of fermentation stopper / stabiliser should ensure that the wine is not fermenting. Tasting and smelling the wine will detect signs of ‘off’ flavours and smells. Putting the wine in a COOL environment where the temperature remains constant should allow it to clear.

The addition of a ‘fining’ agent will usually help speed up the clearing process. Sometimes extra finings might be needed, however, it is important not to over fine as this could lead to a permanent haze.

De-gassing a wine at the end of fermentation helps. The more residual gas that you can get out of suspension the better. You will end up with a cleaner, crisper wine. ‘Racking’ wine from one container to another is also helpful. Sometimes when you cannot get the wine to clear all that is needed is a change of location. Experience shows that in a good percentage of cases the wine is simply being stored in an environment not suitable for clearing.

From the onset you should use enzyme treatment, depending on the recipe make up. Doing this your wine should clear sufficiently when finished and there should be no need to use finings.

A fine sediment will also form once the wine is bottled and ‘laid down’ to mature.

Similarly, if you blend two wines it will most likely cause sediment to form.

In these cases you might need to re-fine your wine if it is hazy and sediment is forming.

We would not recommend fining a wine more than twice and only then after other treatments have failed. It would also be a good idea to put the wine through a filter.

"De gassing" is a process when the wine is ready for fining. When it comes time to stabilize and fine the wine, it has to be stirred vigorously enough to drive off all of the CO2 that has accumulated during fermentation, this process is known as degassing. There are two ways to de-gas the wine either by stirring / agitating vigorously or using a “Degasser”.

This is because the dissolved gas will attach to the fining agents, preventing them from settling out. You need to stir hard enough to make the wine foam, and keep stirring until it will no longer foam. Only then will the gas be driven off so the fining agents can work their magic.

The Degasser tool is easy to use as all you have to do is put the tool into a drill on the lowest speed setting and pull the trigger. This turns the blade’s on the Degasser and causes the Co2 foam to rise to the surface. Repeat this a few times over a few day.

Once fermentation is complete, you can sweeten the wine by adding sugar or a wine sweetener.

Remember that once the wine has been stopped any sugar added can not be removed. Be careful not to over sweeten.

The best thing is to add a little, and taste.

Sorbate prevents the growth of yeast cells and usually added after fermentation to stabilise wine, especially wine that contains some residual sugars. If added before putting in the yeast it is likely that the yeast cells will not be able to grow sufficiently.

Adding more yeast is a good idea but only if you can get hold of an actively fermenting yeast. Yeast from another fermenting wine, or yeast grown in a small culture may work.

This is probably caused by oxidation, which results in the wine being exposed to the air for a period.

Wine should be left laid down in a cool dark place. It should be served slowly, giving it plenty of time and room to breath the air.

Invariably when we are asked this question we find that the winemaker is using a 'hand corker,' a cheap, simple tool where the cork is inserted into the bottle using pressure applied with the palm of the user's hand. This method of corking is usually fine when using corks that have been pre-soaked to make them supple.

However, it is not 100% effective. There are many different makes of corker available, most are relatively inexpensive and if used correctly, will last many years.

We always recommend the use of a 2-handled or a 3-lever type of corker. These are readily available in the shops and provide a much more reliable method of producing an effective seal. For a few pounds more you can get a floor standing type of corker, which will take even commercial size corks.

In order to ensure a good seal in the bottleneck the diameter of the cork is important. Commercial applications use a 24mm diameter.

However, to facilitate the use of hand corking machines in the home brew market, this diameter has been reduced to 22mm. We know that some type of hand corkers are still inadequate at the 22mm diameter and can only provide enough insertion force with extreme difficulty by the operator. This is why We recommend the 2-handled / 3-lever type.

These corks have been treated with an approved silicone material in order to facilitate easier corking. It is not necessary to soak these corks prior to use. If they are soaked a 'milky' residue rubs off and this can be imparted to your wine. Although totally harmless, this residue looks unsightly. It will settle given time and 'racking' or filtering helps to speed up its removal. Also, a silicone treated cork that has been soaked will disintegrate upon extraction from the bottle. The amount of silicone applied to these corks is a compromise between two factors:

a) Too much silicone used could result in the cork coming back out of the bottle due to the reduced friction.
b) Too little silicone used and the cork becomes too difficult to insert into the bottle.

Treated corks undergo a deep cleansing process and are safe to use direct from the packet. There is no need for sterilising before use.

Okay, there are 3 things which are the likely cause.

1. Adding too much water. If you have added the correct amount of water then this will not be the problem.
2. Not stirring after adding all the water. This will leave all the sugars at the bottom of the fermenter which will cause the gravity to be low at the top.
3. Measuring the gravity when the pre fermented wort is too cool. Hydrometers are calibrated at a set temp, usually 20c so if you measure the gravity and the wort is cooler or hotter than this then this will affect the result as liquids become less dense at warmer temperatures.

It's more than likely that one of these is the cause.

If you have added the yeast according to the kit instructions, you should see activity within 48 hours. Bubbles should be passing through the airlock fitted to your fermenting vessel, or if there is no airlock, you should see a healthy ‘pancake’ of yeast developing on the surface of the ‘must’.

If not, the first thing you should do is to confirm your suspicions. Take a specific gravity (SG) reading using a hydrometer. Hopefully you took a reading when you made the kit up and you can compare subsequent readings.

If the second reading shows a drop from the original, it confirms that the wine is fermenting. If it remains the same as the original, it proves that your suspicions are correct. If you did not take, an original reading then take a couple of readings over 24-36hrs. These will also confirm what is happening. Sometimes yeast can work with very little visible signs of fermentation or there could just be an ineffective seal on your fermenting vessel?

Having confirmed there is no fermentation, what next?

Have you actually put the yeast in? It’s possible; with everything going on around you that you forgot it? Check the packaging that came with your kit. Is the yeast still in there? If so, then get the yeast in immediately.

Yeast is a living organism and if it is subjected to adverse conditions, such as heat or damp, it can very quickly become inactive. Unfortunately, this is only realised when we come to use it.

Is it possible that you added too much hot water to the ‘must’ and then added the yeast before it cooled down? It is possible that the yeast was ‘killed.’

Is the environment where we are making the wine suitable?

Kit wines are designed to ferment at room temperature but it is critical that the ‘must’ is not allowed to get too hot or too cold. Usually 18C – 25C is fine. Try to keep the temperature fairly constant as fluctuating temperatures might affect the ferment? Avoid putting the fermenting vessel by a radiator. In colder temperatures, consider using an external heat source such as a Young’s heater belt or pad to keep the ‘must’ warm.

If you have added the yeast and are confident that the temperature is alright but the ‘must’ is still not fermenting then let’s eliminate some other possibilities.

When you sterilised your winemaking equipment you would probably have used a proprietary brand of cleanser.

Most of these include some sort of fermentation inhibitor as part of their make up. This is why it is important that you thoroughly rinse all equipment with cold water before use.

Could you have added the wine stabiliser (Sorbate) that would probably have come with your kit in error? Check all the sachets that you have left. Is the stabiliser still there?

If it is that you add additional sugar initially, did you ensure that this sugar was fully dissolved? Sugar can clog the yeast cells and inhibit fermentation.

Contamination by ‘spoilage’ organisms. This is probably unlikely but have a smell and a taste of the wine. Can you detect anything that is ‘off’?

When you have a wine that is not fermenting, you need to get it going as soon as possible. The unprotected sweet grape juice is an ideal medium for the growth of all sorts of bacteria. However, if you can identify the cause within the first four days you can probably get it going without repercussion.


You can calculate the alcohol strength of your wine simply by using your hydrometer to measure specific gravity (density) (S.G.)

To do this you need to measure and record the S.G before fermentation starts (the initial gravity).

Make sure that the wine ‘must’ is thoroughly mixed otherwise; you will get a false reading which would give an untrue final alcohol measurement. Also you need to measure and record the s.g. At the end of fermentation. (just before bottling is best)

Once you have these two readings subtract the final gravity from the initial gravity and divide the result by a number, which is based on the initial gravity (see below for table) to obtain the alcohol strength of the wine.

1.005 7.73



SUBTRACT 1.000 FROM 1.090 = 90







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