Packaging
Bottling
Transferring finished cider into glass, where the dominant variable is how much oxygen the liquid picks up in the few seconds it takes to fill and close each bottle.
Also called filling, bottle filling.
- Stage
- Packaging
- Traditional in
- No single tradition — used wherever it suits
- What it most changes
- Oxidative character and Carbonation
- Safety
- None recorded
What it is
Bottling is the operation that moves cider from bulk into individual sealed glass containers, and it is the last point at which a producer influences the product. Everything about it — the way the liquid enters the bottle, how much air is left above it, whether the bottle is filled under pressure, what microbiological state the cider is in and how the closure is applied — is fixed at that moment and cannot be revisited. A cider can be made well for a year and undone in the seconds it takes to fill and cap. It is, for that reason, among the most consequential steps in the whole sequence.
Why it is used
- Glass is chemically inert and effectively impermeable, so it is the only common format in which a cider intended to age for years will not be altered by its own container.
- It allows the package to be pressure-rated, which makes bottle conditioning, traditional-method sparkling cider and any highly carbonated product possible in a way that a soft format does not.
- It presents the product as a single unit with its own closure, label and durability date, which is what most retail and export routes require.
How it works
- Oxygen enters at filling by three routes: air dissolved into the liquid by turbulence and splashing at the filling valve, air remaining in the headspace when the closure goes on, and air already in the empty bottle before filling starts. Between them these determine how quickly the cider oxidises in the years that follow.
- Counter-pressure filling equalises the bottle to the tank pressure before liquid is admitted, so the dissolved carbon dioxide has no opportunity to break out; without it, a carbonated cider foams, loses gas and fills inaccurately.
- Headspace can be reduced chemically as well as physically — purging the empty bottle with inert gas, and jetting the headspace immediately before closing so that expanding gas displaces the remaining air.
- Fill height has to be set with any subsequent heat treatment in mind, because liquid expands during tunnel pasteurisation and a bottle filled to the neck has nowhere to put that volume; too little headspace risks the closure, too much guarantees oxidation.
- The microbiological state of the cider at filling determines everything afterwards: a sterile-filtered or pasteurised product is inert in the bottle, a stabilised one is quiescent, and a deliberately live one will continue to ferment and must be filled into a container rated for it.
What it changes
The direction this step pushes the finished drink in, dimension by dimension. A direction, not a measurement: how far it moves depends on the juice, the temperature and how the step is carried out.
| Dimension | Direction | Why |
|---|---|---|
| Oxidative character | Either way | Oxygen picked up at the filler is consumed over the following weeks by phenolics and by free sulphur dioxide, generating acetaldehyde and browning products; a well-run filler leaves that reaction with almost no substrate, a poorly run one sets the ageing trajectory of the whole batch. |
| Carbonation | Preserves | Filling under counter-pressure keeps dissolved carbon dioxide in solution rather than allowing it to break out at the valve, so the gas level in the bottle matches the gas level in the tank instead of falling short of it. |
| Freshness | Either way | Fresh fruit esters are lost to oxidation faster than any other aroma class, so the difference between a careful and a careless fill shows first as a flattening of the cider’s top notes rather than as an obvious fault. |
The chemistry and the organisms
What is actually being changed, and by what. Each entry says what that compound or organism does in cider generally; this page is one place it does it.
Compounds involved
Dissolved oxygen
Essential to a healthy yeast population at the start of fermentation and the principal enemy of a cider from the moment fermentation ends.
Carbon dioxide
The other product of fermentation, which protects a cider from air while it is being made and, dissolved in the finished drink, changes both its texture and its perceived acidity.
Sulphur dioxide
The antimicrobial and antioxidant on which most modern cidermaking depends, and whose effectiveness collapses as pH rises — which makes every sulphiting decision a pH decision first.
Acetaldehyde
The compound sitting one step short of ethanol, which smells of bruised apple and sherry, binds most of the sulphite added to a cider, and is the chemical signature of oxidation.
What it is done with
Bottling lines and fillers, small and large
Filling is where a finished cider is most exposed: oxygen picked up in the last two minutes can undo a year of care, and carbonated product needs a filler that keeps it under pressure until the closure is on.
Counter-pressure filling
Carbon dioxide stays dissolved only under pressure, so carbonated cider poured into an open bottle foams, loses its gas and takes on air; a counter-pressure filler removes the pressure difference by purging and pressurising the bottle first, and vents it under control at the end.
Bottles and pressure: what glass will and will not hold
Sparkling-wine bottles are engineered and tested to hold several atmospheres; still-wine bottles are not engineered to hold any, and filling one with a carbonating cider is the most dangerous ordinary mistake in home cider making.
What can go wrong
Faults that begin at this step, or that this step makes more likely. Each one is set out with its causes and whether it can be put right.
Oxidation
The cumulative effect of oxygen on finished cider: fruit aroma flattens, colour deepens towards amber, and a bruised-apple or sherry-like character replaces the fresh one.
Unwanted refermentation
Fermentation restarting in a sealed container, generating carbon dioxide that was not planned for and pressure that a bottle may not withstand.
Bottle over-carbonation
More dissolved carbon dioxide in the bottle than intended or than the glass is rated for — a presentation problem at the mild end and a physical hazard at the severe one.
Under-carbonation
A cider intended to sparkle that has little or no dissolved gas, usually because the bottle conditioning never started or the closure did not hold.
Excessive sediment
More deposit in the bottle or vessel than the presentation intends, ranging from a normal conditioning yeast layer to a loose sludge that clouds every pour.
Excess sulphur dioxide
A struck-match or burnt-match aroma and a prickle at the back of the nose from too much free sulphur dioxide, with a real health consideration for sulphite-sensitive people.
Microbial haze
Cloudiness caused by a growing population of spoilage organisms, and therefore a symptom of something worse rather than a clarity problem in itself.
Cooked character
A stewed-apple, caramel or jam-like character from heat applied to juice or cider, most often through pasteurisation or hot storage.
Cork taint
A damp-cardboard, wet-newspaper mustiness from trichloroanisole, usually carried by a natural cork but capable of reaching cider by other routes.
Light strike
A skunky, cooked-cabbage or drain-like aroma produced when light acting on riboflavin generates sulphur compounds in a bottle.
Plastic and packaging taint
Plastic, rubber, adhesive or chemical notes picked up from unsuitable containers, liners, hoses, gaskets or cleaning residues.
Atypical ageing
A cider that loses its fruit unusually early and develops a flat, faintly acrid or naphthalene-like character — a syndrome described in white wine and less firmly established in cider.
Pinking
An unexpected pink or salmon tint developing in a pale cider or perry, associated with oxidation of colourless phenolic precursors.
Styles it produces
Categories in which this step is characteristic or required. Some name it in their definition; for others it is simply how they have always been made.
Bottle-conditioned cider
Cider that completes a fermentation inside its sealed bottle, generating its own carbonation and, in most cases, leaving a yeast deposit behind.
Sparkling cider
Cider carrying enough dissolved carbon dioxide to produce a persistent bubble, by bottle fermentation, tank fermentation or injection.
Still cider
Cider with no perceptible dissolved carbon dioxide, presented as a fermented fruit drink whose texture rests on body, acid and tannin alone.
Cider vinegar
Not a cider but its next stage: cider whose ethanol has been oxidised to acetic acid by bacteria, made deliberately as a condiment and arrived at accidentally as a fault.
Pommeau
A blend of fresh apple juice and apple brandy, mixed before fermentation so that the spirit prevents it, then aged in oak.
Sidra de nueva expresión
A modern Asturian category of filtered, clean, dry cider made with controlled fermentation and presented in a wine format rather than in the poured tradition.
Spiced cider
Cider flavoured with spices, either fermented and packaged that way or mulled and served warm, with the two practices frequently confused.
Unfiltered cider
Cider packaged without filtration, retaining suspended yeast and fine solids and the body and aroma that come with them.
Botanical cider
Cider infused with herbs, flowers, roots or bark, a small modern category with old antecedents in the practice of flavouring fermented drinks with what was to hand.
Galician cider
Cider from Galicia and the north-western Iberian fringe, made in a smaller and less codified tradition than its Asturian and Basque neighbours, from a distinct local fruit population.
More on bottling
The chemistry of the fill is straightforward and unforgiving. Cider will dissolve oxygen readily, and every millilitre it takes up is spent over the following weeks: first on free sulphur dioxide, which is depleted and can no longer protect the product; then on phenolics, which oxidise to quinones and drive browning and the loss of fruit character; and along the way on ethanol, generating acetaldehyde with its bruised-apple and sherry-adjacent smell. None of this is visible on the filling line. It shows up months later as a batch that has aged faster than its siblings, and by then the only diagnostic evidence is the difference between bottles filled at the start and end of a run.
Practice differs markedly between traditions, and the differences are not merely cosmetic. Asturian sidra natural is bottled still, without added gas and often with its own residual yeast, and is designed to be poured from a height so that the aeration and effervescence happen in the glass rather than in the bottle. Normandy cidre bouché is filled with residual sugar and closed under a champagne cork and cage, so the bottle itself is a fermentation vessel and must be rated accordingly. English farmhouse practice historically bottled straight from cask with whatever the cider carried, and modern commercial bottling in every country works the opposite way, filtering or pasteurising to inertness so that the bottle is only a container. The filling technology in each case follows the intent.
When bottling goes wrong the causes are usually mechanical rather than mysterious. A filling valve that splashes rather than filling down the wall of the bottle can more than double oxygen pickup; an inconsistent fill height leaves some bottles with excessive headspace air; a capper set slightly out of adjustment leaves crowns that leak gas slowly over months and produce a batch that is flat by the time it reaches the shelf. Live products fail differently, refermenting in bottles that were never intended to hold pressure. The remedy in every case is to treat the filler as a piece of process equipment to be measured and maintained rather than as a tap, and to open and taste bottles from a run rather than trusting that a batch tasted well in tank.
Related processes
Steps that sit alongside this one, replace it, or depend on it having been done.
Packaging
Closure selection
Choosing between cork, crown, screwcap, cage and swing-top, a decision that fixes how much oxygen reaches the cider, whether it can hold pressure, and which faults it is exposed to.
Packaging
Bottle pressure management
Matching the pressure a carbonated cider will actually generate to glass that can contain it, taking account of temperature and of any fermentable sugar left in the bottle.
Carbonation
Bottle conditioning
Carbonating cider by letting a second fermentation finish inside the sealed bottle, so the gas is generated where it is going to stay.
Stabilisation
Sterile filtration
Membrane filtration at a rating that retains viable yeast and bacteria, which is what allows a sweet cider to be shelf-stable without heat or preservative — provided the filling that follows is aseptic.
Stabilisation
Pasteurisation
Heating cider enough to inactivate the organisms that would spoil it, either in the sealed package or in-line before filling, at a measurable cost in fresh aroma.
Packaging
Labelling
Assembling the declarations a container must legally carry, and confirming that the word cider may lawfully be used at all in the market the product is going to.
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- How is sparkling cider made
- How much pressure builds up in a bottle of cider — Enough to matter. Every gram of sugar fermented in a sealed bottle produces gas, and a bottle not rated for it can fail. The French cider appellations require a minimum of 1.0 to 1.5 bar at 20 °C, and a bottle-conditioned cider can go well beyond that if it was filled with more sugar than intended.
- Does cider contain sulphites — Most does. Sulphur dioxide is added to protect juice and finished cider, and fermentation itself produces a small amount even when none is added. European labels must declare it above 10 mg per litre.
- Why did my cider bottles explode — Because fermentable sugar was still present, or too much priming sugar was used, and the pressure exceeded what the bottle could hold. Never bottle a cider whose gravity is still falling, and never use bottles not designed for pressure.
- Which bottles are safe for sparkling cider — A bottle intended for sparkling wine is a different object from a still-wine bottle. It is heavier, thicker, has a deep punt to distribute stress, a reinforced neck and finish designed for a crown cap or a mushroom cork, and it is manufactured and tested against a design pressure.
- How do you pour bottle conditioned cider — Stand the bottle upright for a day, chill it, and pour in one continuous movement, stopping when the sediment reaches the shoulder. Some traditions deliberately rouse the sediment instead, and both are defensible.
Where to go next
- How cider is made — The whole sequence, stage by stage, with the choices open at each one.
- Cider science — The chemistry and microbiology the methods on this page rest on.
- Troubleshooting — What goes wrong, how to recognise it, and whether it can be reversed.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
Cider and perry production technical training material
Peter Mitchell / Cider and Perry Academy · reference work · registered as competent for this subject
Searched again on 2026-08-25 and it remains the one printed source here that a bibliographic check cannot fix, because it is not a published work with an edition. It is course material issued to participants of a training programme, so there is no catalogue record to verify, no ISBN, and no lawful public copy. Its state stays `registered` for that reason rather than through inattention.
The Science of Cidermaking and associated technical writing
Andrew Lea · reference work · passage verified 2026-08-24
Written by a food chemist who worked at Long Ashton on apple phenolics. Unusual among specialist cider writing in that it is primary-research-adjacent: the author is describing work he did, and cites the literature. This is why it is registered at tier 1 for chemistry while a general cider book is not.