How to Brew Chemex Coffee: A Step-by-Step Guide to Perfect Pour Over

Quick Answer

To brew a perfect Chemex, use a medium-coarse grind, a 1:15 coffee-to-water ratio, and follow a precise pour-over technique. Start with a 30-second bloom, then pour in stages to maintain optimal extraction. Use quality beans and a reliable grinder for the best flavor.

The Chemex is a classic pour-over brewer known for its elegant design and ability to produce a clean, bright cup of coffee. Its thick filters remove most oils and fine particles, resulting in a crisp, tea-like body that highlights the nuances of single-origin beans. Whether you're new to pour-over or looking to refine your technique, this guide will walk you through every step.

Brewing with a Chemex is both an art and a science. The key variables—grind size, water temperature, coffee-to-water ratio, and pour technique—all influence the final taste. With practice, you'll be able to adjust these to suit your preferences. Let's dive into the essentials.

Understanding the Chemex

The Chemex was invented in 1941 by Peter Schlumbohm and has remained a favorite among coffee enthusiasts for its simplicity and reliability. The hourglass-shaped glass vessel uses a specially designed filter that is about 20-30% thicker than standard paper filters, which traps more oils and sediment. This produces a remarkably clean cup with a light body and pronounced clarity.

The Chemex comes in various sizes, from 3-cup to 10-cup models. The most popular is the 6-cup, which is ideal for home use. The brewer is made of non-porous borosilicate glass, which does not absorb flavors or odors, ensuring that each brew tastes pure. Its wooden collar and leather tie add a touch of elegance, making it a beautiful centerpiece for your coffee ritual.

• Choose the right size Chemex for your needs: 3-cup for single servings, 6-cup for multiple cups, 10-cup for entertaining.
• Invest in a gooseneck kettle for precise control over water flow.

What You'll Need

Before you start, gather the following equipment: a Chemex brewer, Chemex bonded filters (either pre-folded or flat), a coffee grinder, a scale, a gooseneck kettle, and fresh coffee beans. A thermometer is helpful to ensure water temperature is between 195-205°F (90-96°C).

The quality of your coffee beans and grinder significantly affects the outcome. For a consistent grind, consider using a burr grinder like the Wilfa Zense Grinder with 30 settings, which allows you to dial in the perfect grind size for Chemex. Using freshly ground beans is essential for maximum flavor.

• Use filtered water to avoid off-flavors from chlorine or minerals.
• Pre-heat your Chemex and cups to maintain brewing temperature.

Coffee-to-Water Ratio and Grind Size

The golden ratio for Chemex is 1:15 (coffee to water) for a balanced cup. For a 6-cup Chemex (which holds about 600ml of water), you'll need approximately 40 grams of coffee. Adjust the ratio to your taste: 1:14 for stronger, 1:16 for lighter.

Grind size is crucial. For Chemex, aim for a medium-coarse grind, similar to sea salt. This allows for proper extraction without over-extracting or clogging the filter. The Wilfa Zense Grinder offers settings that can help you achieve this consistency. If you're using a blade grinder, consider upgrading to a burr grinder for more uniform particles.

• Weigh your coffee and water with a digital scale for accuracy.
• Adjust grind size if your brew tastes bitter (too fine) or sour (too coarse).

Step-by-Step Brewing Instructions

Follow these steps to brew a perfect Chemex. The entire process takes about 4-5 minutes.

First, place the filter in the Chemex with the three-layered side against the spout. Rinse the filter with hot water to remove any paper taste and warm the vessel. Discard the rinse water. Then, add the ground coffee and gently shake to level the bed. Start the timer and pour twice the weight of coffee in water (e.g., 80g of water for 40g of coffee) in a circular motion to saturate the grounds. Allow it to bloom for 30-45 seconds. After the bloom, continue pouring in stages, keeping the water level just above the coffee bed. Aim to finish the pour by 3-4 minutes, with total brew time around 4-5 minutes.

• Pour slowly and steadily to maintain a consistent water level.
• Avoid pouring directly onto the filter edges to prevent channeling.

Common Mistakes to Avoid

One common mistake is using water that is too hot, which can cause over-extraction and bitterness. Ensure your water is between 195-205°F. Another is grinding too fine, leading to slow drawdown and a muddy cup. Conversely, grinding too coarse results in under-extraction and a weak, sour brew.

Also, avoid pouring too aggressively, which can agitate the coffee bed and cause uneven extraction. Use a gentle, controlled pour. Finally, don't skip the bloom—it allows CO2 to escape, ensuring even saturation and better flavor extraction.

• If your brew is bitter, try a coarser grind or lower water temperature.
• If it's sour, grind finer or increase water temperature slightly.

Step-by-Step Chemex Brewing Guide

1. Prepare the Filter: Unfold the Chemex filter and place it in the brewer with the three-layered side against the spout. Rinse with hot water to remove paper taste and warm the vessel. Discard the rinse water. Ensure the filter is properly seated to avoid collapse during brewing.
2. Add Coffee and Bloom: Add the ground coffee to the filter and gently shake to level. Pour twice the coffee weight in hot water (195-205°F) in a circular motion to saturate all grounds. Let it bloom for 30-45 seconds. A proper bloom releases CO2 and allows for even extraction.
3. Pour in Stages: Continue pouring water in a slow, steady stream, starting from the center and moving outward. Keep the water level below the top of the filter. Aim to finish the pour by 3-4 minutes. Controlled pouring prevents over-agitation and channeling.
4. Let It Drain: Allow all water to drain through the coffee bed. The total brew time should be around 4-5 minutes. Remove the filter and enjoy your coffee. If the drawdown is too fast or slow, adjust grind size accordingly.

Product Facts

• Wilfa Zense Grinder: The Zense coffee grinder offers 30 settings, durable steel burrs, and a user-friendly design for consistent grinding tailored to your brewing method. With 30 grind settings, you can dial in the perfect medium-coarse grind for Chemex, ensuring even extraction and a balanced cup.
• Filter Coffee Subscription: A seasonal coffee subscription tailored for filter coffee lovers, offering balanced, easy-going, and approachable flavor profiles that change monthly to showcase different single origins. Fresh, high-quality beans are essential for a great Chemex brew. This subscription delivers seasonal single origins that highlight the clean, nuanced flavors the Chemex is known for.

Brewing a great Chemex is all about precision and practice. By following these steps and using quality equipment like the Wilfa Zense Grinder and fresh beans from a Filter Coffee Subscription, you'll be able to enjoy a clean, flavorful cup every time. Experiment with ratios and grind sizes to find your perfect brew. Happy brewing!