A bottling day checklist for homebrewers
Most homebrew faults that reach the glass were made on bottling day, not brew day. This is the checklist we use so the beer you worked on for three weeks arrives fizzy, clean and in one piece.
Before you start: is the beer actually finished?
Bottle too early and the yeast keeps eating sugar that was never meant to be there. That is how bottles over carbonate, gush or burst. So the first item on the list is a number, not a feeling.
Take a hydrometer reading. Take another two or three days later. If the two readings match and they sit close to the final gravity your recipe predicted, the beer is done. A pale ale that started at 1.050 will usually finish somewhere around 1.010 to 1.012. If it reads 1.020 and is still dropping, wait. Airlock bubbles tell you very little; a lid that is not quite sealed can stop them entirely while fermentation carries on.
If you are not sure how to read the instrument, our guide on using a hydrometer covers it, including the temperature correction.
What to lay out the night before
- Bottles: about 30 brown 330 ml bottles for a 10 litre batch, plus a few spares. Crown cap bottles only, no screw tops.
- New crown caps and a capper. A bench capper is easier to use well than the two handed kind.
- A bottling bucket with a tap, a length of food grade tubing and a spring loaded bottling wand.
- No rinse sanitiser, a spray bottle and a bottle brush.
- Priming sugar, a kitchen scale that reads in grams, a small pan and a clean spoon.
- Your brew log, a marker and a towel for the floor.
Clean the bottles first. Sanitiser does not work on dried yeast or dust, so any bottle with a ring of crud at the bottom gets scrubbed or thrown out. Brown glass matters: clear and green bottles let light reach the hop compounds and the beer can turn skunky within minutes in sunlight.
Working out the priming sugar
Bottle conditioning means adding a measured dose of sugar so the remaining yeast makes a small, controlled amount of carbon dioxide inside the sealed bottle. Measure by weight and dose the whole batch at once. Spooning sugar into each bottle gives uneven results.
As a starting point, around 6 to 7 grams of plain white sugar per litre of beer gives a normal ale carbonation of roughly 2.3 to 2.5 volumes of CO2. An English bitter wants less, around 3 to 4 grams per litre. A wheat beer or saison can take more, but only in sturdy bottles. The exact figure depends on how warm the beer has been, because warmer beer holds less leftover CO2. A priming calculator will adjust for that; our guide to bottle conditioning and priming sugar explains the logic.
Dissolve the sugar in about 100 ml of water, boil it for a couple of minutes and let it cool with the lid on.
The bottling sequence, in order
- Sanitise the bucket, tap, tubing, wand and spoon. Give no rinse sanitiser its full contact time as printed on the label.
- Pour the cooled sugar solution into the empty bucket first.
- Siphon the beer in gently, with the tube outlet under the surface so it swirls and mixes without splashing. Leave the yeast cake behind in the fermenter.
- Stir once, slowly. Splashing now adds oxygen, which shows up weeks later as a stale, papery note.
- Sanitise the bottles. Fill each one from the bottom with the wand. When you lift the wand out, the level drops to leave about 2 to 3 cm of headspace, which is what you want.
- Cap straight away. Sanitise the caps, set one on and press down firmly until the crimp is even all round.
- Write the beer name and date on the caps or the case.
Two people make this far quicker: one fills, one caps.
Conditioning in an Indian flat
Keep the bottles somewhere dark at about 20 to 25 °C for two weeks. In most Indian cities that is just a cupboard for much of the year. In May in Delhi or Nagpur, a cupboard can hit the mid thirties. The yeast will still carbonate the beer, but the flavour suffers and hop aroma fades faster. A bucket of water in the coolest corner of the house, with the crate standing in it, takes the edge off.
Store the crate in a closed box or a strong carton. If you have made a mistake with the sugar or bottled early, the box contains the glass. After a week, chill one bottle and open it over the sink. Flat means wait longer. Gushing means chill the whole batch now so the yeast stops working.
Where most bottling days go wrong
The common failures repeat. Bottling before fermentation finished. Guessing the sugar. Bottles that looked clean but were not. A siphon that ran with air bubbles through it. Caps crimped at a slant. Each one is easy to fix once you know the cause. Each one needs a reason, not a tweak.
That reasoning, linking a fault in the glass back to the step that caused it, is what separates a lucky first batch from a brewer who can repeat a good one. It is also the part a checklist cannot teach on its own.
Common questions
How long should homebrew condition in the bottle?
Two weeks at about 20 to 25 °C is a sound default for most ales. Stronger or colder beers can take three or four weeks. Chill and open one bottle before you judge the whole batch.
Can I use jaggery or honey to prime bottles?
You can, but they contain water and varying amounts of sugar, so the dose is harder to get right. Plain white sugar or dextrose is predictable and gives the cleanest result.
Why are my bottles gushing when I open them?
Usually too much priming sugar, bottling before fermentation was complete or an infection. Chill all the bottles at once to slow things down, then check your gravity readings next time before bottling.
Do I need to rinse no rinse sanitiser off bottles?
No. Used at the correct dilution it is designed to be left on. The small amount of foam left behind does no harm to the beer.
