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What Causes Uneven Flow Distribution When Extracting Espresso? What's the Difference Between Bottomless and Split-Flow Portafilters?
Before bottomless portafilters were invented, baristas primarily used portafilters with spouts when extracting espresso. These portafilters mainly come in two types: single-spout portafilters designed for single-shot baskets, and split-flow portafilters for double-shot baskets. The so-called split-flow portafilter refers to the type shown in the picture below, featuring
2025-06-07 espresso extraction uneven flow bottomless portafilter split-flow portafilter coffee brewing -
What is Coffee Channeling? Why Does Espresso Experience Channeling? What Are the Causes and How to Solve It?
FrontStreet Coffee frequently mentions "channeling" in our articles because during the coffee extraction process, channeling negatively impacts coffee flavor. And it occurs quite frequently! So today, FrontStreet Coffee will share with you what channeling actually is and how to address it!
2024-09-03 coffee channeling espresso extraction coffee brewing problems coffee science barista techniques -
What are the signs of over-extracted coffee? Causes and solutions for over-extraction - Can coffee be brewed repeatedly?
Hmm, why is this coffee so bitter? Is it over-extracted? Many people think that bitter coffee is simply over-extracted...
2022-05-15 coffee over-extraction signs causes solutions taste repeatedly brewing -
What Causes Espresso Machine Explosions? Why Do Portafilters Blow Out During Extraction?
With the advent of affordable, compact home coffee machines, more and more people are equipping their homes with coffee machines to enjoy fresh, ground-to-order espresso anytime. However, what's increasing alongside the number of coffee machines is a series of operational issues. Recently, FrontStreet Coffee has noticed that online
2024-05-21 espresso machine safety portafilter explosion coffee extraction FrontStreet Coffee -
What Causes Pour-Over Coffee Blockage and Poor Water Flow? Why Shouldn't You Tap the Dripper? How Do Fine Particles Cause Coffee Over-Extraction?
Like FrontStreet Coffee, many friends develop a temporary "perfectionism" when brewing coffee! When they notice irregularities during the process, they always want to step in and "fix" them to make everything neat and tidy. For example, during the preparation steps before brewing coffee—wetting the filter paper! When the filter paper doesn't completely adhere to the dripper
2024-08-05 pour-over coffee coffee extraction coffee brewing coffee blockage fine coffee grounds -
What Causes Espresso Machine Leaks? Why Do Coffee Machines Drip During Espresso Extraction?
Recently, many friends have provided feedback to FrontStreet Coffee's backend: "Espresso machines often experience leaking during the extraction process." This issue is actually easy to resolve once we understand the underlying principles. Normally, during espresso extraction, water within a sealed space is only subjected to pressure from the coffee machine
2025-01-19 espresso machine leaks coffee machine dripping espresso extraction coffee equipment troubleshooting barista maintenance -
Why Does Coffee Taste Salty? What Causes Salty Flavor in Brewed Coffee? What Are the Signs of Under-Extracted Coffee?
Sour, sweet, and bitter are the three most common flavors we taste in a cup of coffee. Since these three flavors are crucial to the composition of coffee, many articles often focus on these tastes. However, coffee actually contains another hidden flavor beyond these three--saltiness. Coffee
2024-12-07 coffee taste salty coffee coffee extraction brewing methods coffee flavors -
What Are the Signs of Over-extracted Pour-Over Coffee? What Causes Over-extraction in Pour-Over Coffee?
Believe that on your journey of mastering pour-over coffee, you've definitely encountered this situation: appearing completely confident during the water pouring process, but showing nervousness when the coffee liquid in the filter cup starts falling freely, thinking "Why is it flowing so slowly? Hurry up! It's about to be over-extracted. Should I stop the flow? What should I do?"
2021-10-09 over-extraction pour-over coffee signs causes extraction brewing -
What Causes Thin Espresso Crema? Why Does Crema Have Many Large Bubbles? Factors That Make Espresso Taste Bad?
Recently, FrontStreet Coffee discovered while browsing that many friends encounter this situation when extracting espresso: "The extracted espresso has thin crema with many obvious large bubbles! The entire coffee tastes bland, has a thin mouthfeel, and the presence of bubbles affects the beauty of latte art patterns!
2024-06-03 espresso crema thin espresso bubbles espresso extraction problems coffee quality -
Does Pour-Over Coffee Also Have Channeling Effects? What Causes Slow Water Flow and Water Pooling in Pour-Over Coffee?
For professional coffee knowledge exchange and more coffee bean information, please follow Coffee Workshop (WeChat public account: cafe_style). How do turbulence and agitation affect the flavor of pour-over coffee? Pour-over coffee is truly wonderful! You can watch the water flow elegantly during brewing, while well-brewed coffee becomes a crystal-clear liquid,
2023-01-05 pour-over coffee channeling effect slow water flow causes professional -
What is a Coffee Powder Bed, and How to Raise the Powder Bed in Pour-Over Coffee: Causes of Under-Extraction
In FrontStreet Coffee's articles, you'll often find the term "raising the powder bed." Many readers wonder how to raise the powder bed and why it's necessary. In the final stages of pour-over coffee brewing, sometimes coffee grounds accumulate heavily in the center of the filter, sinking to the bottom and causing "flooding" in the brewing process.
2023-07-19 coffee powder bed pour-over coffee coffee extraction coffee brewing under-extraction FrontStreet Coffee -
What Causes Coffee Ground Blockage in Pour-Over Brewing? Why Use the Three-Stage Method? What's the Purpose of Flow Restriction?
When you notice hot water taking unusually long to permeate through the coffee grounds during brewing, and a significant amount of water remains in the filter even after exceeding most of the estimated brewing time, there's no doubt - you're experiencing a blockage! Without proper flow restriction, your coffee will likely develop some unexpected flavors!
2024-09-01 pour-over coffee coffee brewing coffee extraction three-stage brewing flow restriction -
What are the signs of under-extracted coffee? What causes coffee to taste sharp and sour? Why is my pour-over coffee too acidic?
Preface: In the previous article, FrontStreet Coffee explained the flavor characteristics of over-extracted coffee. In this installment of Barista Training Guide, we continue to discuss the flavor profile of under-extracted coffee! What is under-extraction? According to SCA Golden Cup extraction theory, 18-22% of water-soluble substances in coffee contribute to good flavor. Therefore, when brewing coffee, we should maintain an extraction rate between 18-22%
2021-03-13 coffee extraction under what signs sharp sour causes pour-over too acidic -
What Causes Clumping in Espresso Crema? Pay Attention to These Details When Extracting Espresso!
The "golden armor" of espresso--Crema, is a wonderful product unique to pressurized extraction. Its presence not only provides an excellent "canvas" for coffee latte art but also makes the coffee taste richer and fuller. Of course, as FrontStreet Coffee often says, this is on the premise that the crema quality is up to standard.
2024-06-10 espresso crema extraction troubleshooting coffee tips -
What Causes Jagged Patterns in Latte Art? Solutions for Unclear Latte Art Designs
Some friends have asked FrontStreet Coffee for help, "Why is it suddenly difficult to pour clear latte art patterns recently, and why do the designs show obvious jagged edges?" Regarding this issue of "jagged patterns" in latte art, every barista who has ever poured latte art has likely experienced it. Many baristas feel at a loss when encountering this situation, often blaming it on their own poor performance
2022-09-03 latte art jagged patterns coffee techniques barista tips espresso art -
Why Does Your Coffee Taste Sour? What Makes Coffee Sour and What Causes It?
In the article "Why Most Coffee Today is Sour," FrontStreet Coffee explained why most coffee needs to be sour and the reasons for this acidity. Many friends then expressed: I understand why coffee needs to be sour, but another question arises - why does coffee actually taste sour? The answer is simple, because coffee itself naturally contains
2024-09-12 coffee acidity sour coffee FrontStreet Coffee coffee flavor -
What Causes Water Accumulation in the Portafilter Basket After Espresso Extraction and How to Solve It
A friend with an espresso machine asked FrontStreet Coffee, "I've been encountering an issue when extracting espresso recently. After extraction, when I remove the portafilter, I notice water accumulation in the basket, and the extracted coffee puck isn't intact—it's quite wet?" He then mentioned, "At first, I thought the coffee grounds were too fine, so I adjusted the grinder to a coarser setting, but still..."
2022-09-19 espresso machine portafilter water accumulation extraction problems coffee puck grind size -
What Causes Espresso Extraction to Be Sometimes Fast and Sometimes Slow? What's the Difference Between Tamping and Not Tamping? What Are the Consequences of an Overheated Grinder?
Sometimes fast, sometimes slow, sometimes delicious, sometimes not. Yes, FrontStreet Coffee is referring to the unstable state that can occasionally occur when pulling consecutive espresso shots. Not only does the extraction time fluctuate between fast and slow, but even the resulting coffee flavor becomes inconsistent. This is a problem that troubles many coffee enthusiasts, even when using the same
2024-08-02 espresso extraction tamping grinder overheating coffee consistency brewing techniques -
What are the differences between V60 models 01 and 02? Why does coffee brewed with increased dosage taste unpleasant? What are the causes of weak and flavorless coffee?
For most people, coffee dosage is a relatively fixed parameter. After all, it doesn't need to change based on the roast level of coffee beans, so under normal circumstances, we always use a fixed dosage for brewing. However, if sometimes we suddenly need to increase the dosage for brewing, then
2024-07-08 V60 brewer coffee dosage coffee extraction weak coffee flavorless coffee -
What Are the Effects of Coffee Beans That Are Too Fresh? What Causes Throat Discomfort in Pour-Over Coffee?
We know that coffee beans that are too fresh do not produce good flavor when brewed, typically表现为 lacking coffee flavor, thin taste, and a dry sensation that causes throat discomfort. That's why experienced coffee enthusiasts first check the roasting date when they receive coffee beans. If the beans are very close to the roasting date,
2024-12-12 fresh coffee beans pour-over coffee throat discomfort coffee flavor coffee beans