Channeling is often thought to be related only to espresso, but in reality, pour-over extraction can also exhibit this phenomenon. When hot water bypasses the coffee bed and flows directly away through the gap between the filter paper and the dripper, it causes uneven extraction. Drippers with flow-control ribs, such as the V60 and Origami, are more prone to this kind of problem. Channeling manifests differently depending on its severity: in mild cases, hot water flows over the coffee bed and escapes through gaps at the top; in severe cases, the coffee wall is breached, forming obvious fractures, resulting in weak, astringent, and muddy coffee. Fortunately, by adjusting the pouring method—for example, reducing large circular pours and lowering the pouring height—the occurrence of channeling can be effectively reduced. [more…]

If we want to add some extra aroma or flavor to coffee, we do so by adding other ingredients to the coffee so that it takes on their aroma/flavor—this is a very common practice. For example, if we want the coffee to have a certain floral scent, we can steep dried flowers of some kind in the coffee; such as [more…]

When making espresso, have you ever encountered a situation where the flow rate of the coffee liquid alternates between fast and slow, the stream splits, or it even sprays? This is very likely the work of "channeling." Channeling refers to water in the coffee puck bypassing dense areas and quickly passing through paths of lower resistance, creating an imbalanced state in which localized over-extraction and under-extraction coexist. This article will start with the normal extraction performance of a bottomless portafilter, explain in detail the causes of channeling, its specific effects on espresso flavor and quality, and share how to reduce this problem by adjusting operations such as distribution and tamping. At the same time, the article will also mention Front Street Coffee's recommendations for related equipment and bean selections, helping coffee enthusiasts understand and address channeling more intuitively. [more…]

When extracting espresso with a split portafilter, you will occasionally run into uneven flow between the two spouts, and in extreme cases, even one side dispensing liquid while the other dispenses nothing at all. Although this uneven split issue doesn't happen often, it's bound to come up after long-term use. Front Street will analyze the causes from two angles: first, the espresso machine not being level, which causes the liquid to flow toward one side; second, channeling, which prevents the coffee liquid from converging at the center. We will also explain the structural differences between bottomless portafilters and split portafilters, and why the design of modern split portafilters can effectively reduce the flow bias caused by channeling, helping everyone quickly pinpoint and fix the problem when it arises. [more…]

In humid weather, coffee grounds tend to clump, which in turn causes channeling during espresso extraction and affects flavor expression. The WDT (Weiss Distribution Technique) breaks up clumps by stirring with fine needles, making it an effective means of solving this problem. But not every enthusiast keeps distribution needles on hand, so whether everyday items like toothpicks can serve as substitutes has become a common question. Starting from Front Street's actual extraction experiments, this article compares distribution needles and toothpicks in terms of breaking-up effectiveness, grounds bed distribution, and extraction stability, analyzes why toothpicks are unsuitable as substitutes, and offers purchasing advice for distribution needles, helping you achieve more stable espresso in rainy or dry seasons. [more…]

Opening a small coffee shop means that the coffee bean sourcing channels and supplier choices directly determine product quality and operating costs. This article outlines five common coffee bean sourcing methods for small coffee shops, including local ingredient suppliers, professional coffee bean suppliers, training institutions, online brands, and self-purchased green beans for roasting. It also explains the conditions that high-quality commercial coffee beans should meet across five dimensions: freshness, quality consistency, value for money, variety richness, and crema performance. At the same time, drawing on the practical experience of Front Street Coffee, it introduces packaging one-way valve design, roast date labeling, blend recipe stability, and the cost advantages of commercial blends, providing a reference for coffee shop operators looking for a suitable coffee bean wholesaler. [more…]

In pour-over coffee, blooming is a key step to release carbon dioxide and improve subsequent extraction. So can espresso, before high-pressure extraction, borrow this same idea? The answer is yes—this is what is called "pre-infusion." Starting from the underlying principles, this article will explain the similarities between pre-infusion and pour-over blooming, analyze its actual impact on extraction yield and channeling, and offer specific operating recommendations such as low-pressure water delivery and soaking duration. It will also explain which beans are suitable for pre-infusion and in which situations this step can be skipped, helping you manually make more consistent espresso even on a machine without a one-touch pre-infusion function. [more…]

Some coffee enthusiasts like to try mixing ingredients such as osmanthus, granulated sugar, or butter into the coffee puck before extracting espresso, hoping to achieve a more naturally integrated flavor. But is this approach really feasible? Front Street conducted a comparative experiment, mixing granulated sugar into the coffee grounds and adding it directly into the cup, to observe the differences in flavor and extraction parameters of the espresso produced by the two methods. The results showed that sugar mixed into the puck caused the extraction time to shorten significantly, with a sharp and separated taste, while the method of adding it directly into the cup produced a surprisingly well-integrated effect. This article will analyze the experimental process and the reasons behind it in detail, helping readers understand why mixed extraction often backfires. [more…]

When making espresso, placing a circular filter paper in the portafilter basket may seem like a simple action, yet different placement positions can lead to completely different extraction results. Through multiple comparisons, Front Street Coffee found that laying the filter paper at the bottom of the portafilter basket can intercept fine particles, reduce bitterness, and improve cleanliness, but at the same time it weakens body and shortens extraction time; while placing it on top of the coffee puck can disperse the impact of the water flow, reduce channeling, and make the extraction more even, though the effect is relatively limited. This article breaks down in detail the principles, advantages and disadvantages, and practical considerations of these two methods, helping coffee enthusiasts make more suitable choices when dialing in the grind and serving drinks. [more…]

Among the many supplementary techniques for making coffee, RDT (Ross Droplet Technique) is a method of reducing static electricity and clumping by spraying water onto coffee beans before grinding. Its principle is not complicated: during grinding, coffee beans generate static electricity due to friction and uneven charge distribution, causing fine particles to stick together into clumps, which in turn lowers the extraction yield and induces channeling. RDT can effectively alleviate this problem, but it also has obvious shortcomings—it is only suitable for single dosing, the water amount is difficult to control, and long-term use may damage the burrs. In this article, Front Street Coffee breaks down the ins and outs of RDT, its actual effects, and its operational limitations in detail, and offers a more reliable alternative. [more…]

Extracting a qualified espresso is the foundation for making all espresso-based coffee drinks. Espresso can multiply the strengths of coffee beans while also magnifying their flaws without reservation. In practice, the source of many flavor problems points to the same phenomenon—channeling. It doesn't occur rarely; once it happens, hot water concentrates through the puck along paths of lower resistance, creating a situation where localized over-extraction and localized under-extraction coexist, ultimately giving the coffee burnt, bitter, astringent, and other off-flavors. This article will explore several aspects including coffee bean selection, the definition and manifestations of channeling, and optimization techniques for distribution and tamping, to help coffee enthusiasts understand why channeling occurs and how to effectively avoid it in daily brewing, thereby consistently producing a delicious espresso. [more…]

When making espresso in dry weather, coffee grounds often clump together due to static electricity, which in turn causes channeling and affects the final flavor expression. Although most modern grinders are equipped with anti-static devices, some stragglers still slip through into the portafilter. Is there a simple and effective way to solve this problem? The answer is the distribution needle—a small yet practical auxiliary tool, and the workflow it corresponds to is known as the Weiss Distribution Technique (WDT). This article will explain the working principle of the distribution needle, its historical origins, its actual extraction effects, and the troubles that may be encountered during use, helping coffee enthusiasts determine whether this tool is worth purchasing, while also understanding the causal relationship between coffee grounds clumping and static electricity. [more…]

When making espresso, a leveler and a tamper are two indispensable tools. Many people wonder: after leveling, the surface of the coffee bed is already flat, so why do we still need to tamp? In fact, leveling and tamping each serve a different purpose. Leveling aims to distribute the coffee grounds evenly and reduce channeling; tamping compacts the loose coffee bed to withstand the impact of high-pressure water flow. This article will take a deep dive into the differences and connections between the two, explain the correct technique for using a tamper in detail, and answer common questions such as whether you can tamp a second time when the tamp is uneven, helping you pull an evenly extracted espresso at home. [more…]

In the pursuit of an ideal cup of coffee, we often focus on variables such as water temperature, coffee-to-water ratio, and grind size, yet easily overlook a basic but crucial detail—whether the coffee equipment is kept level. In The Science of Coffee Brewing, Scott Rao explicitly points out that keeping the equipment level may seem trivial, but in fact has a decisive impact on the extraction result. When the equipment tilts, the water flow tends toward the lower side due to inertia, causing some coffee grounds to be extracted first, which in turn triggers problems such as channeling, uneven extraction, and even over-extraction. This article will analyze one by one the specific effects of the coffee machine body, the tamping operation, and the levelness of the pour-over dripper on extraction, and provide practical calibration suggestions to help you eliminate this hidden variable in your daily brewing. [more…]

Osmanthus has a rich, intense aroma. When added to coffee grounds and extracted together, can this floral fragrance be infused into espresso? Front Street conducted three sets of comparative experiments, placing dried osmanthus on the surface of the puck, at the bottom, and mixed with the coffee grounds, to observe extraction stability and flavor performance. The experiments found that the density of osmanthus differs greatly from that of coffee grounds, and both the amount used and its position affect the extraction results. For 20g of coffee grounds, it is recommended to add 0.3-0.5g of dried osmanthus; too much will instead破坏 the structure of the puck. The three methods each have their own characteristics: the surface method offers stable extraction, the bottom method gives a pronounced osmanthus aroma, and the mixing method easily produces channeling. Which method is ultimately best for making an osmanthus latte? Let's look at the experimental results together. [more…]

Channeling is a common yet easily overlooked problem in coffee extraction. It refers to water flow bypassing the coffee bed and rushing through along paths of lower resistance, resulting in uneven extraction. This phenomenon is especially pronounced in espresso, but pour-over coffee is equally at risk of channeling. From the perspective of Front Street, this article first explains the essence of channeling, then, using specific cases with the V60 dripper, analyzes several typical manifestations—such as an incomplete coffee bed wall, water pouring breaking through the bed wall, and the liquid level rising with light-roasted beans—to help coffee enthusiasts identify the problem and understand its impact on pour-over flavor. [more…]

More and more people are starting to make coffee at home themselves, but faced with a dazzling array of coffee beans, beginners often don't know where to start. This article focuses on three key dimensions to help beginners quickly find everyday coffee that suits their taste and offers good value for money. First, it is recommended to prioritize corporate stores or brand flagship stores, such as the Guangzhou-based brand Front Street Coffee, which offers a rich variety, fresh roasting, and fast shipping; second, it is important to understand the flavor differences and suitable brewing methods corresponding to the three roast levels: light, medium, and dark; finally, it emphasizes that the freshness date of coffee beans directly affects the taste, with 4 to 30 days after roasting being the optimal flavor period. By mastering these three points, beginners can easily choose coffee beans that are both delicious and affordable. [more…]

When making espresso, you set the parameters correctly yet end up with a cup of sharp, thin coffee—and after knocking out the puck, you find a small hole in it. Behind this puzzling phenomenon, it is actually "channeling" at work. This article will walk you through what channeling is, why it occurs, and how to avoid extraction sputtering and uneven extraction through bean selection, resting, dose control, and proper distribution and tamping. It will also recommend two espresso recipes—Front Street Classic Blend and Front Street Strawberry Candy Espresso—to help you make stable, delicious espresso at home. [more…]

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…]

Distributing the coffee grounds is a crucial step in making espresso, directly affecting the extraction and flavor performance of the coffee. This article, from the perspective of Front Street, systematically explains the purpose of distribution, common misconceptions, and correct operating methods. By understanding the flow characteristics of water through the coffee puck and mastering techniques to avoid channeling, it helps coffee enthusiasts improve extraction uniformity and craft a balanced-tasting espresso. [more…]