Chemex brewing technique: Ultimate Brewing Guide & Expert Tips (2026)

The Chemex brewing technique offers a unique balance of clarity and body, making it a favorite among coffee enthusiasts. This method, developed by Peter Schlumbohm in 1941, emphasizes precise control over water temperature, grind size, and brewing time to achieve a clean and flavorful cup of coffee. With the right parameters, the Chemex can bring out the best in a wide range of coffee beans, making it a versatile tool for any brewing arsenal.

Overview & Background

Invented by Peter Schlumbohm, the Chemex is a manual pour-over coffee maker that uses a filter to separate coffee grounds from the liquid. It is known for its distinctive hourglass shape and the use of a specialized, thick, and heavy filter paper. The Chemex brewing technique is favored for its ability to produce a clean, flavorful cup with a smooth finish. This method is particularly effective for brewing lighter roast coffees, as it allows for a gentle extraction that preserves the delicate flavors and aromas.

Key Brewing Parameters / Specs

• Water Temperature: 195-205°F (90-96°C)
• Grind Size: Medium-coarse
• Brewing Time: 4-5 minutes
• Coffee-to-Water Ratio: 1:16 (60g of coffee for 960g of water)

Step-by-Step Guide

1. Rinse the Chemex: Before brewing, rinse the Chemex with hot water to remove any paper taste and to preheat the carafe. Discard the rinse water.
2. Weigh the Coffee: Use a scale to measure out your coffee. A good starting point is 1:16 coffee-to-water ratio.
3. Grind the Coffee: Grind the coffee to a medium-coarse consistency, similar to sea salt.
4. Add the Coffee: Place the Chemex filter in the carafe and add the ground coffee into the filter.
5. Pour the First Pour: Pour a small amount of water (about 1/4 of the total amount) over the coffee in a circular motion to wet the grounds evenly. Let it sit for 30 seconds to allow the coffee to bloom.
6. Pour the Remaining Water: Slowly pour the remaining water over the coffee in a steady stream, filling the carafe to the desired level. Use a gooseneck kettle to control the flow and maintain a gentle pour-over.
7. Wait: Allow the coffee to steep for 4-5 minutes, depending on your desired strength.
8. Pour Off: Once the brewing time is complete, slowly pour the coffee off the grounds into your serving vessel. Discard the used coffee grounds and rinse the Chemex for future use.

Pro Tips & Common Mistakes

• Consistent Water Temperature: Maintaining a consistent water temperature is crucial for even extraction. Use a thermometer to ensure your water is between 195-205°F.
• Proper Grind Size: The Chemex requires a medium-coarse grind. Grind size can affect the flavor and extraction time, so adjust according to your taste preference.
• Use Fresh Filter Paper: The quality of the filter paper can impact the taste of your coffee. Use fresh, thick, and heavy Chemex filters for best results.
• Avoid Over-Watering: Over-watering can lead to an over-extracted and bitter cup of coffee. Stick to the recommended coffee-to-water ratio.
• Don't Stir the Coffee: Stirring the coffee during brewing can lead to a bitter taste. Allow the coffee to steep naturally.