About the Chemex
History
The Chemex was invented in 1941 by Peter Schlumbohm, a German chemist living in Massachusetts. Schlumbohm held over 300 patents and designed the brewer to combine laboratory glassware principles with functional coffee preparation. Its hourglass shape, fashioned from borosilicate glass with a wooden collar and leather tie, earned a place in the Museum of Modern Art's permanent collection in 1944. The device gained popularity in American households during the mid-20th century and experienced renewed interest during the specialty coffee movement of the 2000s, when manual brewing methods returned to favor among coffee enthusiasts.
Technique
Chemex brewing relies on gravity-fed percolation through proprietary bonded paper filters that are thicker than standard pour-over filters. A typical ratio is 30 grams of medium-coarse ground coffee to 500 milliliters of water heated to 92-96°C. The process begins with a bloom phase, pouring roughly twice the coffee's weight in water and waiting 30-45 seconds to allow CO2 release. Subsequent pours are made in slow, circular motions to maintain even saturation. The thicker filters remove more oils and fine particles than other methods, producing a clean cup with pronounced clarity and a lighter body than immersion brewing.
Ingredient notes
Medium to light roast coffees often work well in the Chemex, as the clean filtration highlights acidity and origin characteristics without the masking effect of oils. Single-origin beans with floral or fruit-forward profiles are commonly chosen to take advantage of the clarity this method provides. Water quality significantly impacts the result; moderately mineralized water extracts flavor compounds more effectively than distilled or heavily treated water. The grind size should resemble coarse sea salt to prevent over-extraction and clogging, as the thick filters already extend contact time compared to thinner paper alternatives.
Variations
Some brewers adjust the coffee-to-water ratio for different strengths, using anywhere from 1:15 to 1:17 depending on preference. The standard Chemex comes in three, six, eight, and ten-cup sizes, though brewing smaller volumes in larger vessels can affect heat retention and extraction. A few practitioners use metal or cloth filters as alternatives to the paper filters, which produces a heavier body and allows more oils through. The brewing technique itself can be modified with different pouring patterns—continuous versus pulse pouring—each affecting turbulence, temperature stability, and extraction evenness throughout the coffee bed.
When to drink & pairings
The Chemex's clean profile makes it suitable for morning drinking when clarity and brightness are desired. Its lighter body pairs well with pastries, fruit-based breakfast items, and mild cheeses that won't overwhelm the coffee's nuanced flavors. The brewer itself often remains at the table for serving, functioning as both brewing device and carafe. Because it produces multiple servings, it works well for small gatherings or leisurely weekend mornings. The method requires attention and time, making it less practical for rushed weekday routines but appropriate when the brewing process itself is part of the experience.