Chemex Brewing Guide: The Art of Clean, Elegant Coffee

The Chemex is an iconic brewing device that combines beautiful design with exceptional coffee. Its thick paper filters produce remarkably clean, tea-like coffee that highlights delicate flavors and aromatics.

What Makes Chemex Special?

Designed in 1941 by chemist Peter Schlumbohm, the Chemex is part of MoMA's permanent collection. Its hourglass shape isn't just beautiful—it's functional, allowing optimal extraction and easy pouring. The thick bonded filters remove oils and sediment, creating the cleanest cup of any pour-over method.

Chemex Sizes and Choosing Yours

3-Cup (16 oz): Perfect for 1-2 people, compact and easy to handle

6-Cup (30 oz): Most popular size, ideal for 2-4 servings

8-Cup (40 oz): Great for entertaining or batch brewing

10-Cup (50 oz): For large gatherings or serious coffee drinkers

Note: Chemex "cups" are 5 oz, not standard 8 oz cups. A 6-cup Chemex makes about 3-4 standard mugs.

What You'll Need

• Chemex brewer
• Chemex bonded filters (natural or bleached)
• Gooseneck kettle
• Scale
• Timer
• Burr grinder
• Fresh coffee beans

The Perfect Chemex Recipe

Ratio: 1:16 (42g coffee to 672g water for 6-cup Chemex)

Grind: Medium-coarse (like sea salt)

Water temp: 200°F / 93°C

Total time: 4:00-4:30 minutes

Step-by-Step Chemex Brewing

Step 1: Prepare the Filter

Unfold the Chemex filter into a cone shape. Place it in the Chemex with the triple-fold side facing the spout. This prevents the filter from collapsing and allows air to escape during brewing.

Step 2: Rinse the Filter

Pour hot water through the filter to rinse away paper taste and preheat the Chemex. Use plenty of water—at least 200ml. Discard the rinse water by carefully removing the filter, pouring out the water, then replacing the filter.

Step 3: Add Coffee

Add 42g of medium-coarse ground coffee to the filter. Gently shake to level the bed. Place the Chemex on your scale and tare to zero.

Step 4: Bloom (0:00-0:45)

Start your timer and pour 80-100g of water in a spiral motion, ensuring all grounds are saturated. The coffee will "bloom" as CO2 releases. Wait 30-45 seconds.

Step 5: First Pour (0:45-1:30)

Pour in slow, steady spirals from the center outward, reaching 300g total by 1:30. Avoid pouring directly on the filter or creating a channel down the middle.

Step 6: Second Pour (1:30-2:30)

Continue pouring in spirals, reaching 500g total by 2:30. Maintain a consistent water level—don't let it drop too low or rise too high.

Step 7: Final Pour (2:30-3:00)

Pour to your final target of 672g by 3:00. Pour gently to avoid agitating the bed too much.

Step 8: Drawdown (3:00-4:30)

Let the water drain completely. Total brew time should be 4:00-4:30 minutes. If it's faster, grind finer; if slower, grind coarser.

Step 9: Remove Filter and Serve

Lift out the filter and grounds. Give the Chemex a gentle swirl to mix the coffee, then pour and enjoy.

Chemex Pouring Technique

Spiral Pattern: Pour in concentric circles from center to edge, then back to center. This ensures even saturation.

Pulse Pouring: Pour in stages rather than one continuous pour. This gives you more control over extraction.

Pour Height: Keep the kettle spout 2-3 inches above the coffee bed. Too high creates turbulence; too low doesn't allow proper aeration.

Pour Rate: Aim for a steady, moderate flow—not too fast (creates channels) or too slow (over-extracts).

Troubleshooting Your Chemex

Brew time too fast (under 4 minutes):

• Grind finer
• Pour more slowly
• Use more coffee

Brew time too slow (over 5 minutes):

• Grind coarser
• Pour faster
• Check for clogged filter (rinse better)

Weak, watery coffee:

• Increase coffee dose
• Grind finer
• Use hotter water

Bitter, over-extracted coffee:

• Grind coarser
• Lower water temperature
• Shorten brew time

Sour, under-extracted coffee:

• Grind finer
• Raise water temperature
• Extend brew time

Chemex Filter Types

Natural (Unbleached)

Brown color, eco-friendly, requires thorough rinsing to remove paper taste. Slightly more texture.

White (Bleached)

Oxygen-bleached (not chlorine), less paper taste, requires less rinsing. Most popular choice.

Square vs. Circle

Square filters fit all Chemex sizes and are pre-folded. Circle filters are for specific models. Most people use square.

Best Beans for Chemex

Chemex excels with light to medium roasts that have bright, complex flavors. The clean filtration highlights delicate notes that would be masked in other methods.

Ideal origins: Ethiopian, Kenyan, Colombian, Costa Rican, Guatemalan

Flavor profiles: Fruity, floral, tea-like, citrus, bright acidity

Chemex Care and Maintenance

Daily Cleaning

Rinse with hot water immediately after use. For deeper cleaning, use a bottle brush or Chemex cleaning brush to scrub the inside.

Deep Cleaning

Weekly or when you notice coffee oil buildup:

• Fill with hot water and add 2 tbsp baking soda
• Let soak for 30 minutes
• Scrub with brush and rinse thoroughly
• Or use Chemex cleaning powder per package instructions

Removing Stains

Fill with ice, add coarse salt, and swirl vigorously. The abrasive action removes stains without chemicals.

Caring for the Wood Collar

Remove before washing. Wipe with damp cloth if needed. Never submerge in water. The leather tie can be replaced if it wears out.

Chemex Variations

Iced Chemex (Japanese Method)

Place ice in the Chemex before brewing. Use less water and brew concentrated coffee directly onto ice. The rapid cooling locks in aromatics and creates bright, clean iced coffee.

Recipe: 42g coffee, 200g ice in Chemex, brew with 472g hot water

Cold Brew Chemex

Use the Chemex as a serving vessel for cold brew. Brew cold brew concentrate separately, then strain through a Chemex filter for ultra-clean results.

Chemex vs. Other Pour-Overs

Chemex: Cleanest, most tea-like, highlights delicate flavors, slower brew

V60: More body, faster brew, more control, highlights complexity

Kalita Wave: Most forgiving, flat bottom, consistent extraction, balanced cup

Pro Chemex Tips

• Buy filters in bulk—they're cheaper and you'll always have them
• Experiment with ratios between 1:15 and 1:17 to find your preference
• Preheat your serving mug to keep coffee hot longer
• Try different water temperatures for different roast levels
• Keep a brew log to track recipes and results
• Use filtered water for best flavor
• Grind fresh immediately before brewing

The Chemex Ritual

Brewing with a Chemex is a meditative ritual. The slow, intentional process forces you to slow down and be present. The beautiful design makes it a pleasure to use and display.

Whether you're brewing for yourself or entertaining guests, the Chemex creates a coffee experience that's as elegant as it is delicious. Master the technique and enjoy some of the cleanest, most nuanced coffee you've ever tasted!