When making espresso at home, many coffee enthusiasts encounter the situation where the coffee liquid suddenly sprays out in all directions—this is actually the work of "channeling." Based on the hands-on experience of Front Street Coffee, this article explains in detail the formation principle of espresso spraying, the uneven extraction problem caused by channeling, and the common causes of this phenomenon, including uneven distribution, overly fine grinding, and static clumping. It also provides a time formula for judging whether the grind setting is appropriate, helping readers make a standard espresso with even extraction and full-bodied flavor at home. [more…]

The flavor expression of pour-over coffee is directly related to the grind size. The coarseness of the particles not only determines how easily water passes through the coffee bed, but also influences the efficiency with which flavor compounds are released. When the grind is finer, extraction resistance increases, the flow rate slows, and the coffee tends toward intensity; when the grind is coarser, water passes through smoothly, the extraction yield drops, and the flavor tends toward weakness. So in everyday brewing, how can you find the right grind setting for beans of different roast levels? Starting from Front Street's brewing experience, this article sorts out the specific effects of grind size on extraction, explains the typical manifestations of over-fine and over-coarse grinds during brewing, and introduces a method for judging whether the grind is appropriate using a 0.85mm test sieve. [more…]

After the bloom, an ideal pour-over should show the water flow churning the coffee grounds, a golden foam layer on top, and an orderly wall of grounds forming along the edge of the dripper. Yet many coffee enthusiasts notice that in the middle and later stages of brewing, all the coffee grounds sink to the bottom while the hot water floats on top, and once dripping finishes, only a flat bed of grounds remains—this is what is often called "ground-water separation." This article focuses on this phenomenon, analyzing one by one the four causes: high-density light-roast beans, over-fine grinding with too many ultra-fine particles, stale coffee beans, and improper pouring technique. Drawing on several high-altitude beans from the Front Street Coffee brand, it offers specific ways to diagnose the problem and ideas for adjustment, helping coffee enthusiasts understand the root of an imbalanced extraction rhythm and find actionable solutions for improvement. [more…]

The French press, with its minimalist operation and extraction results close to cupping, has become the top choice for many coffee enthusiasts starting out. It fully releases coffee oils and aromas while also placing higher demands on bean quality and freshness. This article begins with the origins and structure of the French press, explains why it is better suited to medium-dark roasted coffee, and gradually breaks down the complete French press brewing process—from coffee-to-water ratio, water temperature, and grind size to pouring, stirring, steeping, and pressing—while also answering the question of the oil content in French press coffee. The article also specifically recommends beans suitable for the French press, such as Front Street Strawberry Candy, Front Street Bird of Paradise, and Front Street PWN Golden Mandheling, helping readers easily reproduce a stable and delicious cup of French press coffee. [more…]

How coarse or fine you grind your coffee directly affects the contact area between water and coffee particles and the extraction time, and it is also a key variable that determines whether a cup of coffee tastes good or not. But grind size is precisely the part that many enthusiasts are least sure about. Starting from Front Street Coffee's practical experience, this article first explains the prerequisite effects of fresh roasting and bean resting on grinding results, then analyzes the different flavor directions of fine and coarse grounds, and afterward gives a specific method for calibrating the pass rate with a 0.85mm cupping sieve. It also lists reference ranges for light, medium, and dark roast beans, and finally includes a practical summary for judging coarseness by brewing device when you do not buy a sieve. [more…]

When brewing pour-over coffee, if the filter basket ends up with a thick, muddy bed of grounds instead of distinct, granular particles, it often means the coffee was ground too fine, which easily leads to over-extraction. When faced with the dilemma of pre-ground coffee that cannot be made coarser, besides switching to immersion extraction, there is another distinctive approach using high concentration and low extraction—the mud flow. It uses extremely fine grinding combined with agitation to rapidly dissolve flavor compounds in a short time, then dilutes with hot water, resulting in coffee with a normal extraction yield and full flavor. In this article, Front Street will explain in detail the principles and specific operating parameters of the mud flow, helping you easily tackle the problem of coffee grounds that are too fine. [more…]

The coarseness of coffee grinding directly affects the efficiency of extraction and the final flavor performance, making it one of the key variables that determine whether a cup of coffee is good or bad. From extremely coarse cold brew grinding to Turkish grinding as fine as flour, seven different particle sizes each correspond to the most suitable brewing equipment and methods. This article systematically sorts out the appearance characteristics of each grind size, the applicable scenarios, and why grinding fresh at home preserves flavor better than buying pre-ground coffee powder. It will also explain the taste problems that may arise from improper grind size selection, helping you quickly find the appropriate grinding parameters based on the equipment you have on hand, so that every cup of coffee can present the ideal layering of flavor. [more…]

Which grind size from 1 to 10 is the finest for coffee beans? In most cases, the smaller the number, the finer the grounds. The grind size of coffee beans plays an important role in extracting a cup of coffee. For example, if the coffee grounds are too fine and used for pour-over coffee, it will result in over-extraction, while if they are too coarse, it will result in under-extraction. Secondly, factors such as the beans from each producing region [more…]

Grind size is the key variable that determines the success or failure of a cup of coffee's flavor. Facing the 1 to 10 settings on a grinder, which number actually represents the finest? And how should different brewing methods match grind coarseness? Starting from Front Street Coffee's hands-on experience, this article systematically sorts out the mechanisms by which grind size affects extraction efficiency, compares the grind standards for common brewing methods such as espresso, pour-over, siphon, and French press, and focuses on explaining grind recommendations for medium-light and medium-dark single-origin beans in pour-over scenarios, water temperature pairing, and how to use a 0.85mm No. 20 sieve to precisely calibrate grind size, helping coffee enthusiasts establish clear adjustment logic. [more…]

Grind size has a decisive influence on the final flavor of a cup of coffee: if the grounds are too fine, over-extraction is likely; if too coarse, under-extraction may occur. Faced with the 1-to-10 settings on a grinder, many coffee enthusiasts don't know how the numbers correspond to coarseness, nor are they clear about what grind level to choose for different brewing methods. Drawing on the practical experience of Front Street Coffee, this article systematically sorts out the standards for coffee grind size, the appropriate grind levels for common brewing methods, and the reference values for the EK43 grinder. It also explains in detail how to use a 0.85mm No. 20 sieve for sieve verification, helping you accurately judge and adjust grind size at home, so that every cup of coffee can consistently present its ideal flavor. [more…]

Grind size directly determines the extraction direction of a cup of coffee: too fine a grind easily leads to over-extraction and bitterness, while too coarse a grind may result in under-extraction and a weak, bland flavor. Many grinders on the market mark their settings from 1 to 10, but the corresponding coarseness varies across different models. A smaller number usually means a finer grind, but in practice, you need to judge based on your brewing method. Drawing on the hands-on experience of Front Street Coffee, this article sorts out the grinding ranges for common brewing methods such as espresso, pour-over, siphon, and French press, explains whether medium-light roast and medium-dark roast coffee beans are better suited to a medium-fine or medium-coarse grind for pour-over, and provides specific steps for using a 0.85mm No. 20 sieve to check the passing rate, helping coffee enthusiasts find the right grinding parameters. [more…]

Grind size is the key variable that determines the success or failure of a cup of coffee extraction. If the grounds are too fine, they tend to over-extract and become bitter; if the grounds are too coarse, the extraction is insufficient and the flavor is weak. Starting from the practical experience of Front Street Coffee, this article systematically explains the mechanism by which grind setting affects extraction efficiency, sorts out the grind ranges corresponding to different brewing methods such as espresso, pour-over, and French press, and focuses on explaining the setting of the EK43s grinder in the pour-over scenario—medium-light roast beans are recommended at 10, and medium-dark roast beans at 10.5. It also introduces the specific operation of using a 0.85mm No. 20 sieve for sifting verification, helping coffee enthusiasts quickly judge and correct the grind size, so that every cup of coffee can consistently present the ideal flavor. [more…]

Coffee beans must be ground to release their aromatic compounds, but different extraction methods and devices have vastly different requirements for grind size. Too coarse or too fine will throw the flavor off balance, so is there a generally accepted reference standard? This article uses the industry-standard cupping grind parameters as a baseline and examines, one by one, the suitable grind ranges for the French press, pour-over, cold drip and cold brew, siphon, espresso machine, and moka pot, while explaining how factors such as roast level and water temperature affect the final choice. Drawing on everyday brewing experience, Front Street Coffee offers practical sieve-passing recommendations to help coffee lovers find a grind plan suited to their own equipment. [more…]

Grinding is crucial to coffee extraction—one could say that the coarseness of the coffee grind directly affects the flavor of a cup of coffee. And for different extraction methods, the coffee grind size also needs to be adjusted. The coarseness of the coffee grind directly affects the length of extraction time and the level of extraction yield. Coffee grind [more…]

A delicious cup of coffee is hard-won, because from seed to cup is a very long wait, and even at the final step of extraction, you must ensure that the coffee you use meets brewing standards, because extraction is easy, but have you ever thought about it—coffee grounds extract flavor compounds, so the water used [more…]

The same coffee beans can present a completely different flavor profile when brewed with a different device, and one of the key variables determining the extraction result is grind size. Coffee beans must first be ground to efficiently release aroma and soluble solids, but different devices extract in very different ways, so grind coarseness cannot be generalized. Over-extraction brings out bitter, off-flavors, while under-extraction results in a thin, sour taste, so finding grind parameters that match your device is especially important. Based on Front Street Coffee's hands-on testing experience and using the industry-recognized cupping grind standard—the No. 20 sieve pass-through rate—this article provides recommended grind ranges one by one for the French press, pour-over coffee, cold drip and cold brew, siphon, espresso machine, and moka pot, and explains how roast level, water temperature, and extraction time affect grind adjustments, helping you consistently reproduce a delicious cup at home. [more…]

Coffee beans must be ground before their aromatic compounds can be extracted, but different brewing devices work on different extraction principles, so grind size is not interchangeable between them. Using the industry-recognized cupping grind standard (70–75% passing through a No. 20 sieve) as the baseline, this article systematically breaks down the grind parameters and adjustment logic suited to each common brewing device, including the French press, pour-over, cold drip and cold brew, siphon, espresso machine, and moka pot. From immersion to pressurized methods, from coarse sugar to flour-fine powder, Front Street will explain one by one why each device requires a specific grind size, and how to flexibly fine-tune it according to roast level, water temperature, and extraction time, to help you find the grind solution that best suits your own cup. [more…]

Among the many variables in pour-over coffee, grind size is one of the core factors determining extraction efficiency and the final flavor. The coarseness of the coffee grounds not only changes the speed at which water penetrates the coffee bed, but also directly affects the coffee's strength, body, and the balance of acidity, sweetness, and bitterness. In this article, Front Street Coffee systematically sorts out the mechanisms by which grind coarseness affects extraction, and provides reference grind standards for different brewing methods such as cupping, pour-over, French press, espresso, moka pot, and cold brew/ice drip. It also introduces the calibration method using the No. 20 sieve pass rate, helping coffee enthusiasts find grind parameters that suit them. [more…]

No matter what method we use to make coffee—whether it's pour-over, cold brew, or espresso—we first need to grind the coffee beans into grounds before we begin. The purpose of doing this is to increase the surface area of the coffee that comes into contact with water, speed up the dissolution of flavor compounds, and give the brewed coffee a fuller taste. [more…]

"Excuse me, what grind size should I use for pour-over coffee?" "Why is the grind at setting 10 on your machine different from setting 10 on mine?" "When you say 'sugar-like,' do you mean caster sugar, granulated sugar, or brown sugar?" ... Are you still struggling to find the right grind size for your coffee brewing device? Front Street has an article to [more…]