Fault
Pectin haze
A persistent, slightly viscous haze that will not settle, caused by pectin from the fruit remaining in solution as a colloid.
Also called pectin cloud, gelatinous haze.
- Severity
- Cosmetic — looks wrong, tastes fine
- Where it starts
- Harvest, Juice treatment, Pressing, Fruit preparation
- Can it be fixed?
- Yes, if caught in time
- When you notice it
- Juice treatment, Fermentation, Maturation
- Signs
- 5 recorded
What it is
Pectin haze is the most common clarity problem in home-made cider. Pectin is a structural polysaccharide of the fruit cell wall, released into juice during milling and pressing, and in solution it forms a colloid that scatters light and refuses to settle. Time does not fix it: a pectin-hazed cider can sit for a year and remain exactly as cloudy. It is a cosmetic fault with almost no effect on flavour, but it also blinds filters and interferes with other treatments.
What you notice
Grouped by sense, because that is how the fault presents itself rather than how it works.
To look at
- A soft, even haze that does not clear on standing for months — Persistence is the diagnostic feature. Yeast haze settles; pectin haze does not.
- Cider that clears at the top of the vessel but never becomes bright
In the mouth
- A slight extra body or viscosity on the palate without any other change
How the batch behaves
- A gel or jelly forming when a sample is mixed with methylated spirit — The traditional test: a clot or stringy gel confirms pectin.
- Filters blinding almost immediately when the cider is filtered
When it appears. Present from the juice onwards and simply never clears. A cider that was bright and became hazy has a different problem.
It is the commonest haze in perry and among the commonest in unfiltered cider, and it is the one that most often prompts an unnecessary intervention. Nothing about it affects flavour or stability.
Hochschule Geisenheim, Cider and Perry Academy (Peter Mitchell)
What it is mistaken for, and how to tell
One observation per rival, chosen because it separates them rather than because it describes either. Several of these are not faults at all — a style feature, a normal outcome, or the fruit behaving as it does.
- Starch haze — Iodine. A drop on a sample turns blue-black with starch and does nothing with pectin. This is the one haze test available in a domestic kitchen.
- Protein haze — Temperature. A protein haze commonly appears or worsens on chilling and clears on warming; a pectin haze is indifferent.
- Microbial haze — Whether it is getting worse and whether anything smells wrong. A pectin haze is static and odourless.
- A deliberately unfiltered cider — Whether the cloudiness came with the style. Several traditions are cloudy by intention and the haze is not a finding.
Haze is a defining feature of a good deal of traditional cider and of most perry, and a pectin haze in a perry is close to expected: pear juice holds pectin more stubbornly than apple juice does. It is cosmetic in every case.
What is actually happening
The chemistry or microbiology behind it. Understanding the mechanism is what makes the prevention make sense rather than being a list of rules.
Pectin is a polymer of galacturonic acid, partly esterified with methyl groups, and it is one of the main components of the middle lamella that holds plant cells together. Milling and pressing release it into the juice, where it hydrates and forms a stable colloidal dispersion. The particles are small enough that gravity has essentially no effect on them, which is why settling never works.
Pectinase preparations resolve it by degrading the polymer. Commercial preparations combine several activities: polygalacturonase cleaves the backbone, pectin lyase cleaves it by elimination, and pectin methylesterase removes methyl groups. Once the chains are short enough, the colloid collapses and the remaining solids flocculate and settle.
The enzymes are inhibited by ethanol and work far more effectively in juice than in finished cider, which is why the standard advice is to treat before fermentation. They can be used on finished cider but work more slowly and less completely.
Pectin also has a constructive role that makes indiscriminate destruction of it a mistake. Keeving depends on the fruit’s own pectin methylesterase demethylating the pectin so that calcium ions can cross-link it into a floating gel. A maker who adds pectinase to a juice intended for keeving has destroyed the mechanism the process relies on.
How it happens
| Cause | Stage | How often |
|---|---|---|
| High-pectin fruit, particularly under-ripe or certain cultivars | Harvest | common |
| No pectinase used on a juice that needed it | Juice treatment | common |
| Hard pressing, which extracts more pectin along with more juice | Pressing | occasional |
| Heating juice, which extracts and solubilises additional pectin | Juice treatment | occasional |
| Pectinase added but inactivated by high sulphite, low temperature or the presence of alcohol | Juice treatment | occasional |
| Fruit pressed very fresh without any maceration or conditioning time | Fruit preparation | occasional |
Can it be put right?
Most cider faults cannot be reversed. Where that is the answer it is given plainly — an honest 'this batch is what it is' is more useful than a procedure that will not work.
| Option | Effectiveness | What it involves |
|---|---|---|
| Accept the haze | Reliable | Entirely reasonable. Pectin haze affects appearance and very slightly body; a cloudy farmhouse cider is a recognised presentation rather than a defect, and nothing about the drink is impaired. |
| Add a pectolytic enzyme to the finished cider | Partial | It does work, more slowly than in juice because ethanol inhibits the enzymes. Use the supplier’s rate for the product and give it time and a reasonable temperature. |
| Filter it out | Unlikely to work | Pectin blinds filter media almost immediately. Enzyme treatment has to come first, after which filtration is straightforward. |
| Fine with a conventional fining agent | Unlikely to work | Finings aimed at protein or tannin do little to a pectin colloid and can leave the cider both hazy and stripped. |
| Wait for it to settle | Not possible | A pectin colloid does not settle. Months of patience achieve nothing, which is the practical way most people discover what their haze is. |
CiderHQ gives no additive dosage figures. An addition is a food-safety decision that depends on legal limits, on the juice in front of you and on what you are protecting against, and the right figure comes from your supplier’s or regulator’s own guidance rather than from a general reference.
Preventing it
- Treat juice with a pectolytic enzyme before fermentation where a bright cider is wanted, at the rate and temperature the manufacturer specifies.
- Allow the enzyme its stated contact time before pitching yeast; adding it and fermenting immediately gives it little chance.
- Let fruit ripen and mellow properly, since pectin is progressively broken down by the fruit’s own enzymes as it ripens.
- Do not add pectinase to juice destined for keeving, where the pectin is the working ingredient.
- Test a sample with methylated spirit before deciding a haze is pectin, so the right treatment is chosen.
Pectin haze is the fault where the diagnosis matters more than the treatment, because every kind of haze looks much the same in a glass and each responds to something different. The methylated spirit test takes a minute and separates pectin from everything else: a sample that clots or forms stringy gel when mixed with spirit is pectin, and one that stays dispersed is not.
It is also the one that teaches patience to be useless. Most cellar problems improve if left, and this one does not. Recognising early that a haze is not going to settle saves months of waiting for a vessel that will look identical at the end of them.
Whether it should be treated at all is a genuine question. Cloudy cider has a long tradition behind it and a haze that comes from the fruit is not a sign of anything wrong. The reasons to treat it are that a maker wants a bright cider, or that the cider is to be filtered and the pectin will prevent it.
The keeving exception is worth carrying in mind because it inverts the whole picture. In a keeved ferment the pectin is not a nuisance to be removed but the mechanism itself, and the chapeau brun that floats on a keeved juice is pectin doing exactly what this record otherwise describes as a problem.
The compounds involved
Pectin
The structural polysaccharide of fruit cell walls, which decides how much juice a press releases, whether a cider ever clears, and whether keeving is possible at all.
Galacturonic acid
The sugar acid that pectin chains are built from, released as they break down, and a significant part of why juice from rotten fruit binds so much of the sulphite added to it.
Pectin methylesterase
The enzyme that strips methyl groups from pectin, exposing the charged sites that calcium bridges — which is the reaction the whole of keeving is built on.
Pectin lyase
The chain-cutting activity in a commercial pectinase preparation, which raises press yield and clears a juice by destroying the colloid pectin creates — and destroys the possibility of keeving in the same stroke.
Arabinan
The branched neutral sugar side chains of pectin, which can be liberated intact by pectinase treatment and then form a haze that appears weeks after the juice looked perfectly clear.
Calcium pectate
The gel formed when calcium bridges de-esterified pectin chains, which floats to the surface as the brown cap of a keeve and carries the juice’s nutrients out with it.
Where in the process it arises
Pectinase treatment
Adding pectin-degrading enzyme preparations to juice so that haze-forming and viscosity-forming pectin is broken down before fermentation.
Enzyme addition to pomace
Dosing pectin-degrading enzyme into milled pomace rather than into juice, to raise press yield and change how the cake drains.
Juice clarification
The deliberate use of enzyme, fining agents or mechanical separation to produce a bright juice before fermentation, and what that costs the ferment.
Keeving
Forming a floating pectin gel that lifts nutrients and solids out of the juice, so that the ferment starves before it finishes and leaves natural sweetness behind.
Filtration
Passing cider through a porous medium to reach a stated visual brightness, at a real cost in colloidal material, body and aroma.
Milling
Reducing whole fruit to a pulp so that the press has cell walls it can drain, rather than intact apples it can only bruise.
Faults it is confused with
These present similarly. What separates them is set out on each page.
Starch haze
A persistent haze caused by starch carried in from under-ripe fruit, which has not yet been converted to sugar and stays suspended in the cider.
Protein haze
A fine haze that forms as protein and tannin combine into insoluble complexes, often appearing in a cider that had already been clear.
Yeast haze
Cloudiness from yeast cells that have not settled out, usually because the strain flocculates poorly or the cider has not been left alone long enough.
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.
Where this comes up in a guide
The link lands on the step where the fault arises rather than at the top of the pathway, because that is where the decision that causes it is taken.
Diagnosing a batch that has gone wrong
Something is wrong with my cider. How do I work out what?
How to taste cider and perry
How do I taste cider properly?
Making perry
How do I make perry, and what is different about it?
When the fermentation is not doing what it should
My fermentation is doing something strange. What is going on?
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.
- Why is there sediment in the bottom of my cider bottle — In a bottle-conditioned cider the sediment is yeast and is expected — pour carefully and leave the last centimetre. In a filtered cider it means something has grown since bottling.
- How are apples milled for cider
- What is keeving — Keeving is a technique for starving a ferment of nitrogen so that it stops before all the sugar is gone, leaving a naturally sweet cider. Pectin is made to gel and float as a brown cap, carrying nutrients and yeast out of the juice with it.
- What does pectin do in cider — Pectin is the structural polysaccharide that holds fruit cells together. In juice it holds haze in suspension, and it is the molecule keeving depends on: strip its methyl groups and it will gel with calcium and float the nutrients out of the juice.
- Do i need a filter to make cider
- How is apple juice clarified before fermentation
Where to go next
- The fault finder — Describe what you can smell and see, and narrow it down from the signs.
- All faults — Grouped by where they come from and how serious they are.
- Cider science — The chemistry and microbiology these faults come out of.
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.
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.
Hochschule Geisenheim University — beverage technology
Hochschule Geisenheim · university · retrieved 2026-08-24
German beverage-technology research covering apple wine and fruit juice processing, including the enzymology of clarification.
Institut Français des Productions Cidricoles (IFPC)
IFPC · research institute · retrieved 2026-08-24
The French technical institute for cider production. The authority for the French cultivar classification families, for keeving as an industrial process, and for the pectin and nitrogen chemistry that keeving depends on.