The Live Sediment Test

01Three words on the label

Filter, heat, refermentation. Only one of the three really matters.

Belgian labels carry three words that blur into one in your head. They are three different operations.

• Filtration removes yeast and haze. Trappists do it with a centrifuge: the beer spins, the yeast flies to the walls.
• Pasteurisation is a brief burst of heat. At De Halve Maan in Bruges the beer is taken to 78 °C for a moment and cooled straight away.
• Bottle refermentation means sugar and fresh yeast go into the bottle. The yeast eats the sugar, makes the fizz and keeps working on the shelf.

Westmalle describes its process plainly. The beer goes through a centrifuge, then the brewer adds sugar and active yeast. And on a separate line: «we do not pasteurise». So Trappist Westmalle is technically filtered. And alive.

Hoegaarden is the mirror case. The brewery honestly says the beer is not filtered. But it strips the yeast in a centrifuge, pasteurises the beer and adds fresh yeast for refermentation. It's an aquarium where the water was boiled and the fish were added afterwards. The fish are alive. The water isn't.

Sediment isn't dirt. Sediment is a pulse.

02The method: the Live Sediment Test

Three questions for a bottle. The order matters.

The Live Sediment Test is three questions. You ask them in order of weight, not in the order they appear on the label.

The first question is the one that counts. The second matters less, the third least of all. And «unfiltered», the word the label sells, answers only the third.

03Pasteur had a point

The strongest argument against this guide.

Pasteurisation is not a crime. Pasteur was solving a real problem: beer soured and spoiled on the road. Heat made it stable. Hoegaarden tastes the same in Zagreb as in Lisbon. For millions of people that is what quality means.

Live beer is fragile. Heat, light and time hit it harder. A bottle of Westmalle that spent two years next to a bar radiator can lose to a fresh pasteurised one. Live beer ages. Sometimes beautifully. Sometimes like cheese forgotten in a car boot.

One more thing. Some tasters pick up «cooked» notes in heated beer. Others notice no difference. I found no blind test that settles it.

What this argument doesn't explain: why stable beer so often sells itself through abbeys, monks and the word «tradition». Stability is an honest advantage. It just rarely gets printed on the label in large letters.

04Check your bottle

Pick a bottle from the list or answer three questions yourself.

You can check a bottle offline too. Hold it up to the light: a thin layer at the bottom is yeast. Then look for one of these phrases on the label.

Sediment isn't dirt. Sediment is a pulse.

05Famous brands under the test

24 bottles found in most bars. Filter by verdict.

One brand can earn two verdicts. Duvel and Tripel Karmeliet referment in the bottle. The same brands in a can don't. The breweries say so themselves.

06Who wins, who pays

An abbey on the label is not an abbey in the brewhouse.

Only ten breweries in the world carry the Authentic Trappist Product mark. Five of them are in Belgium: Westmalle, Westvleteren, Chimay, Rochefort and Orval. The rules are strict. The beer is brewed within the monastery walls, by monks or under their supervision. The money covers the abbey's living costs, and the rest goes to charity.

The mark depends on the monks, not the recipe. In 2021 the last monk left the Achel abbey and the beer lost the mark. In 2023 the abbey was sold to a private owner. The beer stayed on the shelves. The mark left with the monk.

Abbey beer is a different story. Leffe is brewed by AB InBev in its own plants. Grimbergen is brewed by Carlsberg outside Belgium and by Heineken inside it. Affligem belongs to Heineken. The abbey lives on the label. The monks live in the logo.

• The big groups win. Abbey aesthetics without abbey constraints. Stable beer ships easily to any bar in the world.
• The Trappists win too, differently: they choose not to grow. Westvleteren officially sells its beer only at the abbey. A business that defends itself from its own customers.
• The buyer pays - reading «abbey» and getting factory stability. And so do bars: they stock whatever the distributor brings, not whatever is alive.

08Matched to your taste

Pick what you already like. Get three live bottles.

09Twenty live bottles

The number on a card is its place by closeness to the line's winner. Scores from 1 to 10 are saved in your browser.

10Your ranking

Built from your scores on the cards. The top five are your next order.

11When the method breaks

Four places where the test lies or stays silent.

12How to drink, where to look in Zagreb

1. 4-5 beers per session, light to heavy: wheat, tripels, dubbels, quads.
2. Drink the darks at 12-14 °C, not straight from the fridge. At 4 °C the caramel and body nearly vanish. Tripels at 6-8 °C.
3. A tulip glass or a chalice. Pour Trappists slowly and leave the sediment in the bottle. With a wit it's the opposite: swirl up the yeast and top up.
4. Water and a piece of bread between beers. 100-150 ml pours if you share a bottle.
5. Put two close bottles side by side. A comparison is more honest than memory.