Introduction:The brew ratio is a key yet often overlooked variable that shapes the flavor profile of pour over coffee. This article takes Panama Geisha Huali as an example. Under the same grind size, water temperature, and brewing technique, we tested the extraction data and flavor differences across four brew ratios from 1:15 to 1:18, analyzing how water volume variations affect concentration, complexity, and aftertaste—helping you fine-tune parameters to unlock the rich aromas of Geisha.
Among the many variables in pour over brewing, the brew ratio may not be as conspicuous as grind size or water temperature, but it is the core element that determines the final flavor direction. Using a washed Huali coffee bean blend containing 70% Geisha as the sample, and keeping grind size, water temperature, and brewing technique constant, we conducted comparative brews using four brew ratios: 1:15, 1:16, 1:17, and 1:18. We recorded the extraction time and flavor performance of each ratio in detail, taking you deep into how water volume changes shape the coffee’s concentration, layering, and aftertaste.
The essence of pour over coffee lies in simultaneously extracting flavors and filtering the coffee during the pouring process. The water flows outward from the pouring point, and the challenge throughout is balance—ensuring sufficient extraction while avoiding over-dilution or under-extraction. When adjusting parameters, grind fineness and water temperature are usually determined first, but the brew ratio is equally crucial: the difference in water volume directly affects the final concentration and flavor presentation of the coffee.
The coffee used in this experiment is washed Huali, a premium bean from Panama’s Boquete region. Grown at an altitude of about 1,500 meters, it is a blend of 70% Geisha, Caturra, and Catuai varieties, processed using the washed method. With a medium-light roast level, it retains the signature ginger flower aroma, citrus notes, and honey sweetness of Geisha, along with a caramel-like gentle finish. It is suitable for various brewing methods such as pour over and French press. Notably, the beans are shipped within 5 days of roasting to ensure they arrive at the peak of their optimal flavor window.
The experiment used 15 grams of Huali coffee grounds as the base, with four brew ratios set: 1:15 (225ml), 1:16 (240ml), 1:17 (255ml), and 1:18 (270ml). All groups had the same grind size (80% passing through a Chinese standard No. 20 sieve), water temperature (90°C), and brewing technique. A V60 filter was used, with a pulsed pouring method: the first pulse poured 30 grams of water (twice the coffee weight) for a 30-second bloom, followed by incremental pouring to reach the target volume. Water was poured gently, with attention to the circle range and speed to avoid uneven absorption in the coffee bed.
The specific performance of each group is as follows:1:15 Brew Ratio(225ml): Extraction time 2 minutes. Flavor highlights bright fruit acids like lemon, grapefruit, and plum, accompanied by the sweetness of green tea and honey. The mouthfeel is full-bodied with a distinct tea-like quality.1:16 Brew Ratio(240ml): Extraction time 2 minutes 20 seconds. The flavor profile is more layered, with interwoven sour-sweet notes of lemon, citrus, and nuts, plus a tea-like nuance, resembling the freshness of fruit tea.1:17 Brew Ratio(255ml): Extraction time 2 minutes 30 seconds. Aromas of berries, lemon, and bergamot stand out. Sweetness and layering are balanced, resulting in an overall clean and refreshing cup.1:18 Brew Ratio(270ml): Extraction time 2 minutes 40 seconds. Ginger flower aroma is intense, but the aftertaste is shorter. The flavors are clear yet somewhat thin.
Overall comparison reveals: The 1:15 ratio yields a higher coffee concentration, with focused and full-bodied flavors, suitable for those who prefer a heavier mouthfeel. The 1:16 ratio enhances flavor richness and achieves better acid-sweet balance. The 1:17 ratio performs best in aroma, layering, and sweetness—refreshing yet substantial. The 1:18 ratio, while showcasing vivid ginger flower notes, lacks complexity and lasting aftertaste. For a complex bean like Geisha, we recommend trying the 1:16 or 1:17 brew ratios to better highlight its delicate aromas and diverse textures.
The above content is compiled by CoffeeHunters, a coffee news website.
