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…]

Grind size is one of the most critical variables in pour-over coffee—it determines the contact area between water and coffee grounds, and also influences extraction time and the final flavor. This article will systematically sort out the logical relationship between grind size and extraction yield, tell you what kind of taste will appear in the cup when the grind is too fine or too coarse, and also introduce how to use a 0.85mm sieve to calibrate the passing rate, and give specific grinding recommendations for beans with different roast levels. If you do not want to buy an extra sieve, the article also categorizes five levels—extra fine, fine, medium-fine, medium, and coarse—so you can quickly find the right setting by comparing it with your own brewing device. [more…]

Many people notice a layer of fine black powder at the bottom of the cup after finishing a latte or espresso, and sometimes dark particles float at the bottom of an iced latte as well. Is this actually normal? Does it affect flavor or health? In fact, this sediment consists of ultra-fine particles that pass through the filter basket holes during espresso extraction. A trace amount is normal, but if a large amount of grounds is visible to the naked eye, it means something has gone wrong in the extraction process. This article starts with where these fine particles come from, analyzes possible factors such as grinding, the portafilter basket, and barista technique, and offers practical solutions like adjusting the grind setting, switching baskets, and adding a paper filter, to help you enjoy a cleaner cup of coffee. [more…]

In an era where filter brewing devices are highly popular, Turkish coffee still insists on being consumed with the grounds, powder and all. This is not backwardness or laziness, but rather something shaped jointly by its sand-brewing extraction method, extremely fine grind size, and deep cultural tradition. From the perspective of Front Street, this article explains why Turkish coffee is not filtered: just how fine its grind really is, how it differs from espresso grounds, how the coffee powder quickly settles in a short time and gives the coffee a rich mouthfeel, and the fortune-telling custom that has arisen from keeping the grounds, helping you fully understand the logic behind this unique coffee culture. [more…]

The grind size in coffee directly affects the contact area between the coffee and water as well as the extraction time, and it will directly impact the coffee's taste. But at the same time, coffee grind size is also the biggest headache for many people! In this article, Front Street will explain how to determine the appropriate grind size for different coffee beans. First [more…]

The grind size of coffee directly affects the contact area between coffee and water as well as the extraction time, and it will directly impact the taste of the coffee. But at the same time, coffee grind size is also the most headache-inducing thing for many people! In this article, Front Street will discuss how to determine what the grind size should be for different coffee beans. First [more…]

Recently, a customer asked Front Street what to do when the coffee beans they bought were ground too fine, suitable for making espresso. I believe many friends have encountered this situation: the ground coffee they bought turned out to be too fine. If brewed with the usual pour-over parameters, it would definitely over-extract. Does that mean it has to be thrown away and can't be used? Today, Front Street will share with everyone [more…]

Coffee enthusiasts often grind their purchased coffee beans into espresso-level fine powder, yet don't know how to handle it—if operated according to regular pour-over parameters, it easily leads to over-extraction. So, can espresso-grind coffee powder actually be used for pour-over or cold brew? And how should the brewing plan be adjusted? In this article, Front Street Coffee uses medium-dark roasted Front Street Mandheling as an example, analyzing the precautions for pour-over with fine powder one by one, from dripper selection, water temperature setting, coffee-to-water ratio to pouring technique, and provides a practical comparison of two coffee-to-water ratios, 1:15 and 1:10, to help you master fine-grind coffee powder at home and avoid waste. [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…]

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…]

From seed to cup, every step determines the final flavor of the coffee, and grind size is often the key link that beginners most easily overlook and most easily get wrong. The tiny differences produced by the same grinder at different settings are enough to make a cup of good beans taste flat or even bitter. This article systematically sorts out the internal relationships between grind coarseness and extraction yield, contact time, and flow rate, and lists one by one the grinding standards corresponding to eight brewing devices: Turkish coffee, espresso, AeroPress, siphon, pour-over, moka pot, cold brew ice drip, and French press. The article also introduces a method for calibrating grind size using a standard sieve, and, based on the SCA-recommended pour-over passing rate, shares the complete brewing parameters and flavor performance of Front Street Ethiopia Huakui natural, for enthusiasts to reference and adjust. [more…]

The grind size of coffee directly determines the contact area between water and coffee grounds as well as the extraction rate, thereby profoundly influencing the flavor profile of the final cup. However, when faced with different brewing devices and roast levels, how to find the right grind size has become a challenge for many coffee enthusiasts. This article draws on the practical experience of Front Street Coffee, first emphasizing the importance of fresh roasting and bean resting, then carefully analyzing the bidirectional impact of grind size on flavor—too fine leads to bitterness, while too coarse results in a weak and bland cup—and provides specific passing rate references for calibration using a No. 20 sieve (0.85mm). It also offers recommendations for matching brewing devices and coffee beans across five levels: extra fine, fine, medium-fine, medium, and coarse, helping readers find their own perfect cup of coffee. [more…]

For more specialty coffee knowledge, please follow: Front Street Coffee (Frontsteet Coffee). In coffee, the coarseness of the grind directly affects the contact area between coffee and water as well as the extraction time, and it will directly affect the taste of the coffee. But at the same time, the coffee grind size is also what gives many people the biggest headache. [more…]

Grind size is one of the key variables determining coffee flavor. The finer the particles, the larger the contact area between hot water and coffee grounds, and the greater the resistance to extraction, which tends to prolong extraction time and increase the extraction yield; the coarser the particles, the opposite is true, and underextraction becomes likely. Different brewing devices have significantly different grind requirements, ranging from the flour-like extremely fine powder for a Turkish pot to the coarse particles for a French press, a very wide span. This article systematically sorts out the relationship between grind size, extraction time, and extraction yield, gives reference grind ranges for espresso and pour-over coffee, and, combined with Front Street Coffee's production experience, explains how to find a grind setting that suits you according to roast level and bean hardness, while also reminding you of the importance of daily maintenance of the grinder burrs. [more…]

Many people, after drinking an Americano or espresso, notice some fine black particles settling at the bottom of the cup—are these actually coffee grounds? And why are they rarely seen in iced drinks? Drawing on Front Street Coffee's practical experience in production, this article explains the sources of very fine particles in espresso extraction, including grinding particle size, the mesh of the portafilter basket, and cleaning of the group head, and offers four actionable improvement measures. The article also records the results of Front Street's test of placing a circular filter paper in the portafilter basket—although it effectively intercepts fine particles, the extraction flow rate and flavor change, requiring readjustment of the grind and dose parameters. [more…]

The production of fines when grinding coffee beans is a normal phenomenon. A moderate amount of fines contributes positively to flavor; what truly causes trouble is excessive fines. Front Street Coffee has noticed that many coffee enthusiasts feel a sense of dread at the mere mention of fines, mostly because they have been tormented by clogged beds that won't drain, scorched bitterness, and astringency. This article first defines what particle size counts as fines, then explains the relationship between the causes of fines and the type of burr set, with a focus on comparing the differences among flat burrs, ghost-tooth burrs, and conical burrs in terms of grind uniformity and fines ratio. Finally, it offers two practical solutions: sifting out fines and adjusting brewing technique, along with rescue strategies for the common situation of abundant fines accompanied by coarse grounds that are also too coarse. [more…]

The coffee grind size directly determines the contact area between water and coffee grounds, thereby affecting the final flavor expression. This article begins with coffee bean freshness management, explaining resting time and the optimal drinking window, then analyzes one by one the taste differences caused by grinding too fine or too coarse. It also provides a specific method for calibrating grind size using a No. 20 sieve, along with a five-level grind classification that can be referenced even without buying a sieve. Combining the brewing practices of Front Street Coffee, the article recommends corresponding grind sizes for different roast levels and brewing devices, helping enthusiasts find the coarseness standard suited to their own taste. [more…]

For more specialty coffee knowledge, please follow: Front Street Coffee (Frontsteet Coffee). The coarseness or fineness of the grind in coffee directly affects the contact area between the coffee and water as well as the coffee extraction time, and it will directly affect the taste of the coffee. But at the same time, the coffee grind size is also what gives many people the biggest headache. [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…]

A delicious cup of coffee is hard-won, because from seed to cup is a very long wait. 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 are what extract the flavor compounds, [more…]