Summer is here, and many people enjoy making cold brew coffee at home, but the filtration step often proves troublesome—the coffee liquid drips extremely slowly, sometimes taking half a day. Why is cold brew filtration so slow? The core reason is that the extremely fine particles in the coffee grounds clog the pores of the filter paper, leaving insufficient channels for the liquid to flow through. This is especially true when making multiple servings at once, as the waiting time gets stretched even further. This article will first explain the causes of clogging, then share three methods commonly used by baristas to speed up filtration: using a filter bag or cloth to pre-isolate the coffee grounds, spreading the coffee grounds at the bottom of the filter paper to intercept fine particles, and using a vacuum filtration device to achieve rapid filtration under reduced pressure. Each approach has its own pros and cons, suiting enthusiasts with different needs, and the article also retains relevant experience and product recommendations from the Front Street Coffee brand. [more…]

When making cold brew coffee at home, the most frustrating step is filtering: the filter paper gets clogged by fine particles, the coffee liquid drips slower and slower, and anyone in a hurry to leave the house can only wait anxiously. Why is the filtration speed of cold brew so much slower than pour-over at the same grind size? Is there a way to get the grounds out in one step, or even skip filtering altogether? This article focuses on the filtration problems of cold brew coffee. It first explains the principle behind clogging caused by fine particles clumping together, then offers three practical solutions: cold brewing directly with a non-woven filter bag, stirring thoroughly after brewing before filtering, and first laying down a bed of coarse coffee grounds to catch the fine particles. The article also includes Front Street Coffee's comparative experiment data and grind size recommendations to help you make a cold brew coffee with full flavor and refreshing fruity acidity. [more…]

When making cold brew at home, the most frustrating part is usually the filtering stage—the coffee liquid drips slower and slower, and even after more than ten minutes it still hasn't finished filtering, with the filter paper completely clogged by fine particles. Why is the filtering speed of cold brew so much slower than pour-over at the same grind size? The main reason is that fine particles clump together and block the pores of the filter paper. Through comparative experiments, Front Street Coffee has summarized three efficient and practical cold brew filtering techniques: cold brewing directly in a non-woven filter bag, insisting on stirring before straining out the grounds, and using coarse coffee grounds as a base layer to intercept fine particles. This article breaks down the principles and operational details of each method one by one, helping coffee lovers quickly enjoy a cup of full-flavored homemade iced coffee even on a busy morning. [more…]

When making cold brew coffee at home, an oily sheen often floats on the surface, and fine sediment may appear at the bottom of the cup, leaving many coffee enthusiasts puzzled. What exactly are these floating substances? Is the coffee spoiled, or is the equipment unclean? In fact, this is closely related to the slow release of water-soluble fats from coffee beans at low temperatures. This article, drawing on Front Street Coffee's practical experience, analyzes the causes of cold brew oils, explains how the differences in mesh sizes of various filtering devices affect coffee flavor, and shares how to use secondary filtration with paper filters and refrigeration settling to make cold brew's juicy feel fuller and its acidity clearer. At the same time, regular deep cleaning of equipment is equally crucial to avoid the accumulation of condensed oil residue that produces a rancid odor. [more…]

Siphon coffee and pour-over coffee are both classic methods for brewing single-origin coffee, yet they deliver strikingly different results in body and flavor. Pour-over is known for its clean, bright, and well-layered cup, while the siphon excels in rich, full-bodied depth and intense aroma. The root of this difference lies in the combined effect of the extraction method and the filtration system: the siphon uses a constant-temperature immersion extraction, combined with a flannel cloth filter that retains oils and fine particles, resulting in a heavier, more substantial brew; pour-over, on the other hand, relies on a drip method with a continuous supply of fresh hot water and uses high-density paper filters to trap impurities, producing an exceptionally clean cup. This article will analyze in depth, from the two dimensions of extraction principle and filtration method, why these two brewing methods bring such different taste experiences, and will include Front Street Coffee's bean selection recommendations to help coffee enthusiasts better understand and choose the brewing method that suits them. [more…]

In recent years, global coffee consumption markets have shown steadily growing interest in cold brew coffee, yet considerable confusion still surrounds this category. Cold brew is essentially an extraction method, not a specific form of cold drink—it refers to the process of slowly dissolving flavor molecules from coffee grounds using low-temperature water as the medium. Compared with hot-water brewing, cold brew's extraction efficiency is greatly reduced due to the constraints of water temperature, so it is necessary to control factors such as time, bean condition, stirring technique, and filtration precision in order to obtain a cup of iced coffee with balanced acidity and sweetness and a clean mouthfeel. Front Street Coffee, combining in-store practical experience with comparative experiments, has sorted out four key variables that affect cold brew flavor, along with operation suggestions that can be replicated at home, for coffee enthusiasts to check item by item. [more…]

Cold brew coffee, with its advantages of simple operation and low cost, has become the go-to choice at home for many coffee enthusiasts. All you need is an airtight container and a low-temperature environment, and after several hours of steeping, you get a full-flavored iced coffee drink. However, many people discover during the process that a layer of oil often floats on the surface of the cold brew liquid, and can't help but wonder whether it has spoiled or the equipment is unclean. Where exactly does this layer of oil come from? And how should it be handled to achieve a clearer taste? This article will provide a detailed explanation of the extraction principles of cold brew, the phenomenon of oil condensation, the selection of filtration equipment, and ways to optimize the drinking experience, while also recommending several coffee beans suitable for making cold brew, helping you easily make a clean, translucent, and outstandingly flavorful cup of cold brew coffee at home. [more…]

Grind size is the key variable that determines the success or failure of coffee extraction, and different brewing devices have significantly different requirements for particle diameter. This article systematically sorts out the corresponding grind settings from French press to espresso machine, introduces the industry-recognized cupping standard and the No. 20 sieve pass rate as calibration references, and provides specific scale references for the EK43s grinder. Whether you prefer immersion or pour-over, you can find suitable grind parameters here. The article also specifically reminds readers that coffee bean density and roast level will affect the actual particle coarseness at the same setting, so it is recommended to repeatedly confirm with the same beans. Several Front Street Coffee beans are also used as examples throughout to help readers understand the logic of grind adjustment more intuitively. [more…]

On the surface of an espresso, that layer of golden-brown foam is often regarded as a sign of extraction quality, but in essence it is a structure formed when carbon dioxide bubbles are wrapped by the water-soluble fats inside the coffee beans. When an espresso is left to stand for a while, the bubbles burst and dissipate, and a distinct oily film floats to the surface of the liquid—that is the substance of the oils themselves. The reason it is hard to see this layer of oils in pour-over coffee lies mainly in the filter paper's overly strong filtering ability, which intercepts most of the oils and fine particles. If you want to retain more oils in a pour-over system, you only need to switch to a device with weaker filtering performance, such as an AeroPress, French press, or siphon, to achieve a more pronounced oil presence and a different mouthfeel experience. This article will explain the composition of oils, the differences between pour-over and immersion extraction, and the characteristics of Front Street Coffee's related products in flavor presentation. [more…]

In the world of coffee brewing, the choice of filtration medium often determines the flavor direction in the cup. From Turkish coffee, which was mainly boiled before the 19th century, to the filter paper and dripper invented by Mrs. Melitta, to the artisanal use of flannel cloth in Japan, each filtration method carries a different extraction logic. Today, the filter paper, flannel cloth, and metal mesh commonly used in pour-over coffee each have their strengths and weaknesses: filter paper brings a clean and transparent mouthfeel, flannel retains oils and fine particles, achieving a rich and mellow flavor, while metal mesh poses new challenges in terms of pore size and extraction method. Front Street Coffee uses Ethiopian Santa Vini beans for comparative brewing, and by adjusting the pouring technique, reveals the causes of under-extraction with metal mesh and directions for improvement, providing a practical brewing reference for coffee enthusiasts. [more…]

For more specialty coffee knowledge, please follow our WeChat official account: Front Street Coffee (FrontStreet Coffee). No matter what equipment is used to brew coffee, the coffee beans need to be ground, and the purpose of this is to allow the coffee's flavor substances to dissolve more quickly. Of course, not all of the coffee's soluble [more…]

Brewing a good cup of coffee makes grind size an unavoidable key variable. If the particles are too coarse, flavor extraction is insufficient; if ground too fine, it easily brings out bitter and off-flavors. But just how coarse counts as coarse, and how fine counts as fine? And how should you convert between different brewing devices? This article uses the industry-recognized cupping standard as its baseline and the No. 20 sieve pass-through rate as a unified ruler, providing reference grind ranges one by one for French press, pour-over, cold brew drip, and espresso machines, explaining how roast level and bean density affect grinding results, and finally including Front Street Coffee's approach to dialing in espresso extraction, helping you turn grind size from "guesswork" into "data." [more…]

For more specialty coffee knowledge, follow our WeChat public account: FrontStreet Coffee (FrontStreet Coffee) No matter what equipment is used to brew coffee, the coffee beans must be ground, the purpose being to allow the coffee's flavor compounds to dissolve more quickly. Of course, not all of the coffee's soluble [more…]

Can filter paper only be used for pour-over? In fact, in cold brew, ice drip, espresso, and even moka pot brewing, filter paper also plays an important role, just with different functions emphasized. This article compiles the practical experience of Front Street Coffee and explains one by one the specific uses of filter paper in different extraction methods: why cold brew needs secondary filtration, what roles the upper and lower filter papers in an ice drip brewer each play, what changes adding filter paper above the puck or at the bottom of the portafilter basket brings to espresso, whether a moka pot should use filter paper, and the correct approach to using filter paper to filter coffee grounds. Whether you are just starting out or want to refine your technique, you can find practical reference solutions here. [more…]

People who buy their own beans, grind them, and brew pour-over coffee often face a choice when it comes to filtration: should they use disposable paper filters, reusable stainless steel mesh filters, or flannel cloth filters? Each of the three methods has its own adherents, and each directly affects the clarity, body, and aroma expression of the coffee in the cup. This article starts from material characteristics, ease of use, taste differences, and maintenance points, comparing the pros and cons of paper filters, metal mesh filters, and cloth filters one by one, and offers selection suggestions for different taste preferences. If you often drink Front Street Coffee's medium-to-dark roasted beans, or prefer light-roasted beans with floral and fruity notes, understanding these filtration details can help you adjust your brewing direction more accurately and find the cup of coffee that suits you better. [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…]

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…]

The siphon coffee maker, with its experiment-like brewing process, has become the tool of choice for many coffee enthusiasts just starting out. However, to brew a good cup of coffee with a siphon, mastering the operating techniques is only part of the story—choosing the right coffee beans is equally crucial. What kind of coffee is the siphon suitable for brewing? How exactly does it differ from the pour-over coffee commonly seen in cafés in terms of extraction method and filtration method? And how do these differences affect the final taste and flavor? In this article, Front Street Coffee will analyze the two aspects of extraction method and filtration system, guiding you to understand the reasons behind siphon coffee's rich, full-bodied, and intensely aromatic character, while comparing it with pour-over coffee's clean, bright, and well-layered traits, helping you better understand both brewing methods and find the cup that suits you. [more…]

Cold brew coffee, with its refreshing and smooth taste brought about by low-temperature extraction, has become increasingly popular among coffee enthusiasts in recent years. All you need is coffee grounds, cold water, an airtight container, and a refrigerator to make it easily at home. However, many people find in practice that their homemade cold brew is never as rich and sweet as what they get at coffee shops, and sometimes it even turns out cloudy with sediment. Drawing on Front Street's practical experience, this article systematically sorts through the bean selection approach, steeping time, coffee bean freshness, stirring technique, and filtration key points for cold brew coffee, helping you identify where the problem lies and make a cup of cold brew coffee with full flavor and a clear texture. [more…]

What is the first step in brewing coffee? Grinding beans. In recent years, with the rise of the specialty coffee wave, more and more people have come to enjoy drinking coffee, and at the same time, more and more people hope to fully experience the beauty and leisure of drinking coffee, so they choose to buy coffee beans and brew them at home. And so at this point, a [more…]