The Chemex makes the cleanest cup in coffee. Its thick bonded filters strip out oils and fine sediment, leaving a bright, tea-like clarity nothing else quite matches. The catch: those same filters make grind and pace matter more than usual.
What Makes the Chemex Unique
The Chemex is an hourglass-shaped glass carafe with a built-in funnel, invented in 1941 and still made to the same design. Two things define how it brews:
- Very thick, bonded paper filters—about 20–30% heavier than standard filters. They trap oils and micro-fines that thinner papers let through, which is why the cup is so clean and sediment-free.
- A single vessel, so the brewed coffee collects in the same carafe you pour from.
That heavy filter is the whole personality of the Chemex. It gives you the clarity but also slows the flow, which is why Chemex grind runs a touch coarser than a V60. If you want to understand the filter side of the equation, see paper vs metal coffee filters.
What You Need
- A Chemex (the 6-cup is the versatile default).
- Genuine Chemex filters (bonded, either pre-folded squares or circles). Substitutes rarely match the thickness.
- A burr grinder for even particle size—why it matters.
- A scale and timer.
- A gooseneck kettle for a controlled pour.
- Fresh, ideally medium-roast coffee.
The Recipe (Start Here)
| Variable | Value |
|---|---|
| Coffee | 30 g |
| Water | 500 g (1:16.6 ratio) |
| Grind | Medium (slightly coarser than V60) |
| Water temp | 93–96°C |
| Bloom | 60 g water, 30–45 seconds |
| Total time | 4:00 – 5:00 |
The Chemex shines at larger batches—it is a genuinely good brewer for two to four cups. Scale with the same ratio: 45 g coffee to 750 g water fills a bigger carafe nicely.
Step by Step
1. Seat and rinse the filter
If using the square pre-folded filter, open it so the triple-fold side sits against the pouring spout—this keeps the glass from collapsing the paper and lets air escape. Rinse thoroughly with hot water. The thick paper holds a lot of papery taste, so rinse more generously than you would a thin filter. Pour out the rinse water through the spout, keeping the filter in place.
2. Add coffee and level
Add 30 g of grounds and shake gently so the bed is flat.
3. Bloom (0:00 – 0:45)
Start the timer and pour about 60 g of water to saturate all the grounds. Watch it swell as CO₂ escapes—this is the bloom. Wait 30–45 seconds. A vigorous bloom means fresh coffee; a flat one suggests stale beans.
4. Main pours (0:45 – ~3:00)
Pour the rest of the water in slow, concentric spirals, keeping the level below the top of the filter. Work in two or three pours, letting the bed drop a little between them:
- Bloom: 60 g
- Second pour: up to ~300 g
- Final pour: up to 500 g
Because the thick filter slows drainage, do not panic if the level sits high—just pour gently and let it work.
5. Drawdown (until ~4:00–5:00)
Let the last water pass through. The Chemex runs longer than a V60—a total of 4 to 5 minutes is normal and correct thanks to the heavier paper. Lift out the filter, give the carafe a swirl, and serve.
Reading Your Cup and Adjusting
| Problem | Likely cause | Fix |
|---|---|---|
| Sour, weak | Under-extracted | Grind finer, hotter water, slow the pour |
| Bitter, harsh | Over-extracted | Grind coarser, cooler water, gentler pour |
| Drains too slowly / stalls | Grind too fine, filter clogged | Grind coarser; make sure the filter is seated with the thick side to the spout |
| Too fast, thin | Grind too coarse | Grind finer |
For a full walkthrough of taste faults and fixes, see why is my coffee sour or bitter.
Chemex vs V60: Which Should You Use?
They are cousins with different priorities:
- Chemex — thicker filter, cleanest and brightest cup, longer brew, better for larger batches and a slower ritual. Grind slightly coarser.
- V60 — lighter filter, more body and immediacy, faster brew, more responsive to pour technique, best for 1–2 cups. See the V60 guide.
If you love clarity and brew for more than one person, the Chemex is hard to beat. For a fuller comparison of manual methods, the pour-over coffee overview lays them side by side.
Common Chemex Mistakes
- Under-rinsing the filter. The thick paper needs a proper hot rinse or your first cups taste of cardboard.
- Grinding too fine. The dense filter already slows flow; a fine grind chokes it and over-extracts. Go medium, not fine.
- Facing the filter the wrong way. The triple-fold layer goes against the spout so water drains and air escapes properly.
- Rushing the pour. Clarity comes from a calm, even pour and an undisturbed bed.
- Using a blade grinder. The Chemex's clarity exposes every uneven particle. A burr grinder is essential to get its best.
Quick Reference (TL;DR)
- 30 g coffee : 500 g water (1:16.6), medium grind, water 93–96°C.
- Rinse the thick filter well, thick side to the spout.
- Bloom 60 g for 30–45 s, then pour in slow spirals.
- Total time 4:00–5:00—longer than a V60 is normal.
- The Chemex trades a little body for unmatched clarity; grind coarser than you would for a cone.
Keep Learning
- The full method: Pour-Over Coffee: The Art of Manual Brewing
- Its faster cousin: Hario V60 Guide
- Why filters change the cup: Paper vs Metal Coffee Filters
- Pour with control: Pour-Over Flow and Agitation
- Get the ratio right: Coffee-to-Water Ratio