How to Brew Chemex: The Complete Guide to a Clean, Sweet Cup

The Chemex Is Not Just a Pretty Carafe

The Chemex 6-Cup Classic is one of the most recognizable coffee brewers in the world, and for good reason. It produces a uniquely clean, sweet cup that no other pour-over method quite replicates. The secret is not the hourglass shape or the wood collar — it is the filter.

Chemex filters are 20-30% thicker than standard pour-over filters. They are bonded paper, meaning multiple layers fused together. This extra thickness absorbs more oils and fine particles than a V60 or Kalita Wave filter, producing a cup with almost no sediment, less body, and remarkable clarity. If you like your coffee bright, sweet, and tea-like, the Chemex delivers that better than anything else.

Grind Size: Coarser Than You Think

Here is where most people go wrong with the Chemex. Because the thick filter slows drainage significantly, you need to grind coarser than you would for a V60 or flat-bottom dripper. Aim for medium-coarse — roughly the texture of coarse sea salt.

On a Timemore C2, that is around 22-26 clicks. On a Baratza Encore, around setting 20-24. On a Comandante C40, 28-32 clicks.

If you grind as fine as you would for a V60, the thick Chemex filter will choke. Your brew will stall, water will pool on top, and the result will be bitter and over-extracted. When in doubt, err coarser.

The Filter Fold

Chemex filters come as squares or circles, but both need to be folded into a cone. Here is the technique:

1. Fold the filter in half, then in half again to form a quarter-circle cone shape.
2. Open the cone so that three layers face the spout side of the Chemex and one layer faces you.
3. Place the filter in the Chemex with the three-layer side against the pouring spout. This prevents the filter from collapsing against the spout and blocking airflow.
4. Rinse thoroughly with hot water. Chemex filters are thick and carry more paper taste than thinner filters. A proper rinse takes more water than you think — use at least 500ml. Discard the rinse water through the spout.

The airflow channel along the spout is critical. If the filter seals against the glass with no air gap, drainage slows to a crawl. Always keep the triple-fold side against the spout.

The Recipe

This recipe produces two cups (roughly 500ml total). Scale down proportionally for a single cup.

Dose: 30g coffee, ground medium-coarse | Water: 500g at 205F (96C) | Target time: 4:00-4:30

1. Rinse your filter and preheat the Chemex. Discard rinse water.
2. Add 30g of ground coffee. Shake gently to level the bed.
3. Start your timer. Pour 60g of water to bloom, saturating all the grounds. Wait 45 seconds.
4. At 0:45, begin pouring in slow, steady circles. Pour in pulses of about 100g, keeping the water level in the upper half of the filter cone. Avoid pouring directly on the filter walls.
5. Finish all 500g of water by 3:00-3:15.
6. Let it draw down completely. Total time should land between 4:00 and 4:30.

If the brew finishes before 3:30, grind finer. If it is still dripping past 5:00, grind coarser.

Equipment That Matters

A gooseneck kettle is more important for Chemex than for almost any other brewer. The thick filter means flow rate and pour placement directly affect extraction evenness. The Fellow Stagg EKG or Cosori Electric Gooseneck both give you the control you need.

A scale with a timer is not optional. The Timemore Black Mirror Basic Plus or even a basic KitchenTour scale will work. You need to track both weight and time to hit the 4-minute target.

Grind quality matters more with Chemex than with most brewers because the thick filter amplifies the difference between even and uneven extraction. A 1Zpresso JX-Pro or Fellow Ode Gen 2 will give you consistent results. Budget grinders work, but the Chemex will expose their weaknesses.

Why the Chemex Tastes Different

The double-bonded filter removes most of the coffee oils that give body to a French press or metal-filtered brew. What remains is a cup that emphasizes sweetness, acidity, and delicate flavor notes. Fruit-forward Ethiopians and bright Kenyan coffees shine in a Chemex. Heavy, chocolatey Brazilians can taste thin and underwhelming.

This is not a flaw — it is a feature. The Chemex rewards light to medium roasts with complex, clean flavors. If you prefer heavy body and richness, look at a Clever Dripper or French press instead.

The Bottom Line

The Chemex is simple but unforgiving of two specific mistakes: grinding too fine and not rinsing the filter enough. Get the grind right (coarser than V60), rinse the filter thoroughly, and aim for a 4-minute total brew time. The result is one of the cleanest, sweetest cups any home brewer can produce.