How to Brew Coffee with a Chemex: Step-by-Step Guide

Ever wondered how baristas and coffee enthusiasts get such clean, aromatic pours from a Chemex? More than just a pretty piece of glassware, the Chemex is a precision brewing tool — unchanged since its invention in 1941 by German chemist Peter Schlumbohm. Its hourglass shape and bonded filters produce a clean cup loved for highlighting subtle notes in specialty coffee. Here’s how to use one properly.

To brew with a Chemex, use a medium-coarse grind (similar to sea salt), a 1:15 to 1:17 brew ratio, 90–96°C water, and aim for a total brew time of around 3:30–4:30 including bloom. This guide walks through each step to get balanced, flavorful results.

What Is a Chemex and Why Use It?

The Chemex coffee maker is a classic manual pour-over device, instantly recognisable by its hourglass-shaped glass body and leather-wrapped wooden collar. Designed in 1941 by Peter Schlumbohm, it’s been called ‘synthetic logic with a touch of madness’. Unlike other drippers, its thicker bonded filters remove more oils and sediment, resulting in a cleaner, lighter-bodied cup. It’s favoured for highlighting clarity and subtle aromatics in single-origin coffees.

Why the Chemex Brewing Method Works

The Chemex method relies on controlled variables: water temperature, grind size, agitation, and timing. The thick paper filters slow extraction slightly, allowing finer control over body and clarity. The wide brewing chamber also encourages even flow, reducing channeling. With proper technique, you can highlight floral, fruity, or acidic notes without harshness or muddiness.

Step-by-Step: How to Use a Chemex for Coffee Brewing

Follow these steps in order for consistent, professional-quality results.

1. Heat Your Water

Begin by heating filtered water to between 90–96°C (195–205°F). You’ll need enough for both preheating and brewing — typically around 700ml for a standard 8-cup Chemex brew (about 500ml yield).

2. Weigh and Grind Your Coffee

Weigh out 30–35g of freshly roasted whole coffee beans. Grind to a medium-coarse consistency, resembling coarse sea salt. This grind size works well with the Chemex’s thicker filters to balance flow rate and extraction.

3. Prepare the Filter

Take a Chemex-branded filter — it’s thicker than standard paper. Fold it into a cone shape following the built-in creases so that one side has three layers, the other one. Place it in the top of the Chemex with the thicker side centred over the pouring spout.

4. Rinse the Filter and Preheat

Pour hot water through the filter to saturate it completely. This removes any paper taste and preheats the Chemex body. Discard the rinse water.

5. Add Coffee Grounds

Place the freshly ground coffee into the rinsed filter. Shake gently or use your fingers to level the bed for even saturation.

6. Start the Bloom

Start your timer. Pour just enough hot water (about twice the weight of the coffee, approx. 60–70g) to saturate all the grounds. Let it bloom for 30–45 seconds. This releases trapped CO₂ and improves extraction quality.

7. First Pour (Main Extraction Begins)

After the bloom, begin pouring in slow, steady spirals. Add water up to about 150–170g total. Aim to keep the water level consistent and avoid pouring on the filter edges.

8. Second Pour (Continue Extraction)

Wait until the coffee bed settles (roughly 30–45 seconds after first pour), then continue pouring in stages. Add water up to about 300–350g total. Maintain a steady flow and avoid disturbing the grounds.

9. Third Pour (Final Extraction)

Once the water drains halfway, pour again to reach your target brew weight (typically 500ml total water). Total brew weight should be around 1:15 to 1:17 coffee to water ratio — about 30g coffee to 450–500ml water. Complete pouring by around the 2:30–3:00 mark.

10. Final Drip and Serve

Allow the rest of the coffee to draw down completely. Total brew time should land between 3:30–4:30 minutes. Remove the filter, swirl the Chemex gently to mix the brew, then pour into preheated cups.

Brewing Tips and Common Mistakes

Consistency is key. Use a gooseneck kettle for control, weigh your coffee and water, and track time. Avoid pouring too fast or unevenly, which can lead to under-extracted or bitter cups. Don’t let the coffee sit on the filter too long after brewing — it can over-extract.

Frequently Asked Questions

What is the ideal coffee-to-water ratio for Chemex?

The recommended brew ratio for Chemex is between 1:15 and 1:17. For example, use 30g of coffee to 450–500ml (16–17oz) of water. This range highlights clarity and balance without over- or under-extracting.

What grind size should I use for Chemex?

Use a medium-coarse grind, similar to coarse sea salt. This allows for the proper extraction time through the thicker Chemex filter while avoiding over- or under-extraction.

What water temperature is best for Chemex brewing?

Heat your water to between 90–96°C (195–205°F). This range is optimal for extracting flavours without scorching the grounds or over-extracting bitterness.

How long should a Chemex brew take?

Total brew time — including bloom — should be around 3:30 to 4:30 minutes. If it’s much faster, your grind may be too coarse; if slower, your grind might be too fine or your pour too slow.

Do I need to preheat my Chemex?

Yes. Always rinse the filter with hot water and discard it, then pour hot water into the Chemex itself to preheat the vessel. This maintains brewing temperature and improves extraction quality.

Can I use any coffee in a Chemex?

Yes, but Chemex highlights clarity and subtle notes, making it ideal for single-origin or lightly roasted coffees. Try FrontStreet Coffee’s Ethiopia Yirgacheffe for citrus and floral tones, Brazil Queen Manor for nutty sweetness, or Kenya Little Tomato for bright acidity.

Recommended FrontStreet Beans for Chemex Brewing

For the clean cup that Chemex is known for, try FrontStreet Coffee’s Ethiopia Yirgacheffe — bright with citrus and floral notes, perfect for highlighting delicate aromatics. Brazil Queen Manor offers a smooth, nutty base with low acidity, ideal for balance. Kenya Little Tomato brings juicy acidity and berry-like brightness, showing off the Chemex’s clarity. All three showcase the pour-over method’s strengths. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.