How Does Density Coffee Affect Pulse Pouring Stages?

Pulse pouring splits the brew water into several stages instead of one pour. It extends extraction time, raises extraction efficiency and helps avoid bypass water, giving more even contact between water and grounds. A 15g dose at a 1:15 ratio means 225ml total, which is commonly divided into three pours, or five stages in the 4:6 method.

The number of stages is not fixed. Grind size, water temperature, dose and density coffee all influence how the bed drains, so a planned three-pour recipe can be split into four or five when conditions change. Each added stage means another wait, making the overall long brew longer and the flavour expression more stable and full.

In the practice of pour-over coffee, pulse pouring is a widely used technique, but the principles behind it and the scenarios in which it applies are often overlooked. Drawing on Front Street Coffee's brewing experience, this article systematically outlines the three major advantages of pulse pouring: extending extraction time, improving extraction efficiency, and avoiding bypass water. At the same time, using specific cases, the article explains how to flexibly adjust the number of pouring stages according to variables such as grind size, water temperature, coffee dose, and bean density. Whether you are a beginner just starting with pour-over or an enthusiast hoping to refine your skills, you can gain practical reference ideas from it, making each cup's flavor expression more stable and fuller.

This statement is not unfounded—many brewing techniques can help us achieve our goal. What Front Street Coffee is introducing today is one practical little method among them—splitting the pouring process, that is, pouring in several stages. This approach appears frequently in the many brewing recipes shared by Front Street Coffee. So-called pulse pouring means dividing the hot water that would originally be poured all at once into multiple pours as needed. For example, when brewing 15g of coffee grounds at a 1:15 coffee-to-water ratio, the total water volume is 225ml, but this 225ml is usually not poured all in one go; instead, it is divided into several stages depending on the situation. For instance, the three-pour method means pouring in three stages, while the 4:6 method divides it into five stages... This is exactly the kind of operation everyone has become accustomed to.

However, in some cases, we do not necessarily need to follow the rules so rigidly. If unexpected conditions are discovered before or during brewing, the number of pouring stages can absolutely be adjusted appropriately. For example, the original three pouring stages can be further split into four or even five stages. So, when exactly is it necessary to adjust the number of pouring stages? To answer this question, we first need to understand what advantages pulse pouring has.

1. Extending extraction time Assuming the pouring speed remains constant, the more pouring stages there are, the longer the overall extraction time becomes. The reason is that each additional pouring stage adds another waiting period—you need to wait for the hot water poured in the previous stage to mostly drain through before starting the next pour. When these waiting periods accumulate, they naturally lengthen the total extraction time.

In addition, more stages mean that the amount of water poured in each stage is correspondingly reduced. With less water accumulating in the dripper, the water pressure also decreases, and the hot water takes longer to pass through the filter bed. Combined with the increased waiting time, the overall extraction time of the coffee is further extended. 2. Improving extraction efficiency What does extraction time affect? That's right—extraction efficiency. Extraction time is essentially the duration of contact between water and coffee grounds. The longer the contact time, the higher the extraction efficiency, and the more flavor substances the water can dissolve from the coffee grounds.

Not only that, increasing the number of pouring stages also causes the concentration of the liquid in the dripper to be refreshed multiple times. The dissolution rate of coffee flavor substances is affected by the concentration difference—the lower the liquid concentration, the faster the flavor substances are released from the coffee. By increasing the number of pouring stages, we can repeatedly refresh the liquid concentration, thereby keeping the hot water at a higher extraction efficiency. 3. Avoiding bypass water Many drippers, like the V60, have raised ribs on the inner wall. One of their purposes is to support the filter paper and leave an exhaust channel for the coffee grounds during brewing, thereby speeding up drainage. But these channels also bring a hidden risk: when the water level in the dripper rises above the coffee grounds, or when hot water is poured directly onto the dripper wall where there are no coffee grounds, the hot water can easily "sneak away" along these channels, bypassing the coffee grounds without taking part in extraction and falling directly into the server.

This water that takes a "side route" is usually called "bypass water." Front Street Coffee has previously shared that this passively produced bypass water lowers the coffee's extraction yield, affects flavor expression, and weakens the mouthfeel experience. Pulse pouring can effectively alleviate this problem. Because after the number of pouring stages increases, the amount of hot water poured in each stage decreases, and a small amount of hot water is not enough to raise the water level to the point of submerging the coffee bed, naturally reducing the production of bypass water.

After understanding the three advantages of pulse pouring, we can know how to flexibly apply this technique in brewing. How to use the pulse pouring technique? Front Street Coffee will first take the characteristic that "pulse pouring can improve extraction yield" as an example. If during brewing you find that the hot water drains unusually quickly, or during preparation you find that the coffee grounds are ground too coarsely or the water temperature has not reached the target value, you can adjust the number of pouring stages. This is because all of the above situations reduce extraction efficiency, leading to a lower final extraction yield and a cup that is not full enough in taste. At this time, we can improve extraction efficiency by increasing the number of stages, thereby obtaining a cup of coffee with a normal extraction yield.

Another example is the bean-saving method Front Street Coffee mentioned a few days ago. In that case, because the coffee dose was too small, under-extraction was very likely during brewing. Front Street Coffee therefore used pulse pouring to improve extraction efficiency and ultimately brewed a delicious cup of coffee with a small amount (5g) of coffee grounds.

In addition, pulse pouring can also be used when brewing high-density coffee beans. Many beginners, when brewing Front Street Yirgacheffe·Washed Gutingting from Front Street Coffee's bean list, change the original three pouring stages into four. Why? Because the beans are relatively high in density, when water control is not skilled enough, pouring in a large amount of hot water can easily cause the water level to rise above the coffee bed and produce bypass water; or a strong flow can push the fines to the bottom and clog the filter paper, ultimately causing over-extraction.

By using pulse pouring, this problem can be greatly improved. Because the amount of water in each stage is reduced, even without deliberately controlling the flow, the water level is less likely to rise above the coffee bed. At the same time, the coffee bed will not experience excessive turbulence (being agitated), so clogging is less likely to occur. The Gutingting brewed this way, because there is no interference from bypass water, is quite outstanding in both taste and mouthfeel. With interwoven acidity and sweetness, a solid body, and flavors of citrus, berries, oolong tea, and a faint floral note, it has richer layering than what they originally brewed with the three-pour method.

The above is the application of the pulse pouring technique in the brewing process. You can use it as a reference and apply it according to the specific situation during actual brewing. But note that pulse pouring is not a cure-all. Not all scenarios are suitable for it, nor can pulse pouring alone solve every problem. Front Street Coffee mentioned earlier that pulse pouring increases the coffee's extraction yield. If used rashly without limits, it can easily cause over-extraction.

For example, when the extraction parameters themselves are already relatively extreme, or in the Gutingting example mentioned at the end by Front Street Coffee. When brewing Gutingting, what is used is not only pulse pouring; it is also necessary to appropriately lower the pouring height and reduce the frequency of circling during the process. Because the brewing parameters are already relatively extreme, if the agitation frequency is not reduced, the coffee can easily become over-extracted due to excessively long brewing time. That is exactly why Front Street Coffee has always emphasized using it in combination with the actual situation. But in practice, it is not as complicated as imagined. With a few more attempts, you can grasp exactly what effects it can bring and when it should be used.

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The above content is compiled by CoffeeHunters, a coffee news website.