The most impatient moment in the wine year is the one when the fermentation is finally still and the young wine stands in the demijohn as cloudy as dishwater. Precisely then most people reach for the filter or tip fining agents in at random. Both are almost always premature. Fining is ninety percent waiting and ten percent the right move at the right time. I'll show you the order that has worked for me for decades, and where you save yourself work.
First you do nothing at all
When the fermentation is through, self-clearing begins. Yeast, fruit-pulp residues and cloudy matter are heavier than the wine and sink to the bottom by themselves over days and weeks. Cold helps you with this more than any agent: stand the demijohn in the coolest corner of the cellar, ideally at 8 to 12 degrees. In the cold the suspended matter falls faster and firmer, and the wine binds less of what you don't want in it.
Honestly wait out this first round, two to four weeks, before you even think about fining. As a young lad I once fined a still gently fermenting apple wine, because I was in a hurry. The carbon dioxide drove all the cloudiness back up, and I stood in front of a cloudier demijohn than before. Wine can't be driven, it can only be accompanied.
The racking, and why you don't do it too early
The racking is the most important move of the whole fining: you draw the clear wine off the top and leave the sediment (the deposit at the bottom) behind. Take a tube or siphon, set the end a good bit above the sediment and let the wine run calmly into a clean vessel. Don't shake, don't tip, don't try to squeeze the demijohn out at the last second. The last two fingers' width above the sediment you'd rather leave standing than pull the cloudiness back into the clear wine.
Before you rack, make sure with the must hydrometer that the fermentation is really over and no notable residual sweetness is still working. A wine that secretly ferments on never goes bright, because rising gas constantly stirs up the sediment. Usually you need two rackings a few weeks apart: the first takes away the coarse yeast, the second, after the next resting phase, the fine remainder. After just these two moves a well-behaved wine is often so clear that you don't have to do anything more.
Pectin: the cloudiness that never goes away by itself
Some cloudiness won't sit itself out. Apples, quinces, pears, berries and stone fruit are rich in pectin, a jelly-like substance that holds suspended particles trapped as if in a cloud. A pectin veil falls out neither through waiting nor through normal fining, and a filter only clogs up on it. You have to tackle that at the root.
You can test for it with the pectin test: add about twice the amount of high-proof wine spirit to a mouthful of must, wait a minute or two. If gelatinous threads or lumps form, you have pectin in it. Then an anti-gelling agent is called for, an enzyme (pectinase) that breaks up the pectin chains so that the cloudiness can sink at all.
You best add the enzyme early, into the must or the young mash, not into the finished wine. It works distinctly faster in the warm than in the cold, so for that let the batch stand a few hours at room temperature and then give it time. Dose always as per the pack instructions, here it applies: more doesn't help more, just costs more money. Whoever adds the anti-gelling agent beforehand with pectin-rich fruit spares themselves half the fining trouble afterwards.
Kieselsol: a mineral brings down the rest
Once the wine is racked and pectin-free but still dull rather than bright, the actual fining comes. My agent of choice is Kieselsol, a silica sol. The tiny, negatively charged mineral particles attract the finest cloudy matter, clump into larger flakes and take them along to the bottom. What previously hung in suspension as a fine mist lies after a few days as a deposit at the bottom, and you simply rack it off next time.
The duet with gelatine
Classically you work Kieselsol in a pair with gelatine, the so-called two-component or duet fining. Gelatine is positively charged, Kieselsol negatively; together they attract each other and pull the cloudiness down particularly thoroughly. The clever part: the two balance each other out. Whoever takes only gelatine and overdoes it gets a stubborn protein haze back; the Kieselsol catches exactly this excess again. In which order and amount you set up the two is on the pack, and you should stick to that instead of dosing by feel.
Why vegan is possible
Gelatine is obtained from animal connective tissue, so a wine fined with it is not vegan. Kieselsol, on the other hand, is purely mineral. And the nice thing: Kieselsol can also fine on its own, especially against protein-caused haze. For a vegan wine you simply leave the gelatine out and work with Kieselsol alone, or you combine it with a plant protein like pea protein instead of animal gelatine. With most fruit wines I do excellently with Kieselsol solo and don't have to give any thought to the question of vegan or not.
Patience beats the filter
I know the filter is tempting, because it makes things bright at once. But filtering is a coarse intervention: it pulls aroma and body out with it, needs equipment, clogs up at once with pectin- or yeast-cloudy wine and, in case of doubt, presses oxygen into the wine. A wine that has been cleanly racked and fined with Kieselsol goes so clear by itself that you don't need the filter any more. I filter at most once a year, and mostly I'm annoyed afterwards that I did it.
When a cloudy wine is perfectly fine
Not every cloudiness is a fault. Naturally cloudy apple wines, partially fermented new wine, yeast-cloudy batches and some perry positively live off their haze, and if you drink the wine yourself and soon anyway, a light veil is completely harmless. What matters is which cloudiness you have in front of you. A fine yeast veil that settles after standing is good-natured and often part of the character. Milky-hazy that won't fall points to pectin. And if a pungent or acetic-sour smell comes with the cloudiness, then your problem isn't the fining but an infection that no Kieselsol in the world heals. In 1998 I lost a whole demijohn of berry wine to acetic spoilage, because I took my nose seriously too late; since then I always check the smell first, then the eye.
My two reaches for the shelf
For the fining itself I take the Joenos Kieselsol 15%, because it's vegan, can be used solo or as a duet with gelatine, and the 100-ml bottle easily lasts for a cellar run with a few demijohns. Whoever regularly sets up large amounts more sensibly reaches straight for the litre container, otherwise the small bottle is the more honest choice.
Against pectin haze with apple, quince and berry I add the Arauner Kitzinger anti-gelling agent beforehand into the must, because the enzyme makes the cloudiness settleable in the first place. It's a remaining stock of the Kitzinger traditional company, which closed in 2024 and whose knowledge we carry on here, and while stocks last I'm glad to work with the original. You need both only if your wine demands it. A cleanly racked, patiently matured drop often gets by entirely without.
From the cellar, Magnus