Introduction:Since its launch in 1941, the Chemex coffee maker has become a classic thanks to its minimalist yet aesthetically pleasing design. This article will delve into the design highlights of the Chemex, how it differs from regular pour over setups, and guide you through four key brewing elements—grind size, water temperature, coffee-to-water ratio, and technique—to help you master the correct brewing method. We also carefully selected four single-origin pour over beans from different regions and roast levels, providing detailed brewing parameters and flavor profiles to help you discover your own ideal coffee taste.
The Chemex coffee maker was invented in 1941 by a chemist. Its most iconic feature is the all-in-one glass brewing vessel and filter cone structure, which eliminates the need for a separate filter holder. This innovative design is not only practical but also celebrated for its simple and elegant appearance, making it one of the most representative design works of the 20th century—so much so that it is still housed in the Museum of Modern Art. Compared to standard pour over tools, the most notable differences with Chemex are its proprietary filters and wide-mouth design, which require more precision during brewing and can better highlight the clean flavors of coffee.
When using Chemex for pour over, the key still lies in mastering the four main variables: grind size, water temperature, coffee-to-water ratio, and brewing technique. These factors not only affect extraction efficiency but also directly determine the final flavor expression. First, regarding grind size, it’s recommended to adjust according to roast level. Light roast beans, where flavor compounds are mostly concentrated in the shallower layers of the cell walls, are best brewed with a medium-fine grind—roughly between 75% to 80% passing through a Chinese standard No. 20 sieve—ensuring full flavor release without over-extraction. For medium-dark or dark roasted beans, where flavors shift toward caramel and woody tones, a coarser grind is advised to avoid extracting excessive bitterness and harsh notes.
Water temperature is another crucial variable. For light roast beans, which are rich in fruit acids and volatile aromatic compounds, a higher temperature—around 90 to 93°C—is recommended to bring out clear top notes like citrus and berries. In contrast, for dark roast beans, it’s better to lower the temperature to 86 to 89°C to avoid extracting too much astringency and smokiness, resulting in a smoother cup. Overall, the ideal water temperature range for pour over is roughly 86 to 93°C, which can be fine-tuned based on bean characteristics.
The coffee-to-water ratio is key to determining strength.A ratio of 1:14 to 1:16falls within the golden range of the Golden Cup Standard, meaning a concentration of about 1.15% to 1.35% and an extraction yield of 18% to 22%. In practice, using a1:15coffee-to-water ratio within this range can maintain good taste balance while showcasing the flavors of most coffee beans. For example, using 15 grams of coffee with 225 grams of water is a commonly used standard recipe.
As for brewing techniques, common methods include the three-pour method, single-pour (also known as “one-pour”), and drip-by-drip. For most users, especially beginners, the three-pour method is easier to master and clearly brings out the different flavor stages. For light to medium roast beans, it’s suggested to start with a small amount of hot water for a bloom to awaken the coffee’s aroma, then gradually add water in stages, allowing the coffee liquor to release various flavor layers—top, middle, and base—sequentially. This approach leads to a more立体 and balanced overall cup.
Below are four recommended coffee beans well-suited for brewing with Chemex, each featuring different roast levels and regional characteristics to showcase a diverse range of flavors. The first is the Ethiopia Yirgacheffe Guddina, a light roast grown at an altitude of about 1900 to 2300 meters and processed using the washed method. It presents distinct notes of citrus, honey, and berries. Recommended brewing parameters: medium-fine grind (approximately 78% passing through a No. 20 sieve), 90°C water temperature, and a 1:15 coffee-to-water ratio using the three-pour method. This setup highlights layers of black tea and citrus, with a creamy, almond-like sweetness in the aftertaste.
The second is the Kenya Assaliya, a medium-light roast from the Thika region, primarily consisting of the SL28 and SL34 varieties and processed with a 72-hour washed method. It features flavors of black plum, cherry tomato, and brown sugar, with bright acidity and a juicy profile. Suggested parameters: 91°C water temperature, 1:15 coffee-to-water ratio, and medium-fine grind (approximately 77% passing through a No. 20 sieve). Using the multi-pour technique helps emphasize its intense fruit acidity and sweet finish.
The third is the Brazil Queen, a medium roast using the Yellow Bourbon variety from the Queen Estate in São Paulo State. Processed via honey or natural methods, it showcases notes of nuts, cream, and black tea. Recommended parameters: slightly lower water temperature at 88°C, 1:15 coffee-to-water ratio, and medium-fine grind (approximately 75% passing through a No. 20 sieve). The multi-pour method brings out a smooth fruity sweetness and chocolate aroma, with soft and clean acidity.
Lastly, we recommend the Indonesia PWN Golden Mandheling, a medium-dark roast from the Gayo Mountains in Sumatra, using the Ateng variety and wet-hulled processing. It features dominant notes of nuts, caramel, and wood. Recommended parameters: 88°C water temperature, 1:15 coffee-to-water ratio, and a slightly coarser grind (approximately 73% passing through a No. 20 sieve). Using the multi-pour technique highlights rich, bold chocolate and nutty undertones, with a balanced and layered mouthfeel.
In summary, the Chemex is not just a practical coffee tool, but also a brewing method that emphasizes detail and flavor expression. Whether you’re a beginner just starting with pour over or an experienced coffee enthusiast, you can brew your own perfect cup by mastering the four key elements—grind size, water temperature, coffee-to-water ratio, and technique—and experimenting with beans of different roast levels.
The above content is compiled by CoffeeHunters, a coffee news website.
