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Introduction to hand-brewed coffee: Why do you need to make coffee in stages? What do you think of the height of manual water injection?

Published: 2026-03-07 Author:

Last Updated: 2026/03/07, When we make coffee by hand, we generally consider parameters that play a leading role, such as powder amount, degree of grinding, water temperature, ratio, extraction time, filter cup, and water injection method. Since the water injection method is the most controlled by humans, it is often divided into more details, including the number of sections, water flow size, circling speed, and water injection point.

When we make coffee by hand, we generally consider parameters that play a leading role, such as powder amount, degree of grinding, water temperature, ratio, extraction time, filter cup, and water injection method. Since the water injection method is the most controlled by humans, it is often divided into more details, including the number of segments, water flow size, circling speed, water injection point, etc.

In addition, careful friends paid attention to another less eye-catching parameter: the water injection height, which is the distance between the water injection position and the liquid surface. The other party asked Qianjie if the height of water injection would affect the taste of coffee? Is the higher the water filling point for making coffee, the better?

Why should we pay attention to the water injection height?

According to Qianjie's observation, when it comes to injecting water, some people like to circle the spout close to the liquid surface, while others are accustomed to raising the straight water flow to inject. There are also conservatives like Qianjie who control the water injection height to 3 - 4 cm throughout the process. In fact, no matter which operation, you can make a delicious cup of coffee, so there is no such thing as "optimal water injection height."

But everyone also knows that the biggest charm of hand flushing is that it can form dynamic coordination between different parameters, and at the same time, feedback problems based on the results, so as to make flexible adjustments.

For example, in terms of techniques, not only does water fill circles or at a fixed point in the center, or the size of the water flow affect the extraction rate of coffee, but the force of entering the water will also change the flavor of coffee, and a large part of this is determined by the height of the water flow. Therefore, in order to achieve uniform extraction, we must grasp the appropriate water injection height and combine it with other parameter planning to allow the coffee powder to fully and reasonably contact hot water in order to brew delicious coffee.

What impact does the water injection height have on coffee?

Qianjie's requirements for water injection are very simple. The water column is vertical, uninterrupted, and the circle is stable. The water column hits the water surface without bubbles.

Qianjie once compared that higher than 7cm not only easily causes the water column to show an arc, but even breaks into drops of water to drip, and bubbles will be generated when the liquid surface is shot down. The hot water only comes into contact with the surface coffee powder, causing insufficient extraction. Therefore, the height of water injection is recommended to be around 0~7cm. In addition, the height of water injection will have three different effects.

1. In hand flushing, the water column will speed up the release of soluble substances by constantly "flushing,""digging" and "stirring" the coffee powder.

The higher the water injection point is raised, the stronger the penetration force will be, and the stronger the force will be to wash the coffee powder layer, and then the more quickly the substances such as bitterness and miscellaneous taste will be released. Not only that, the larger the turbulence, the greater the agitation of the coffee powder, and some fine particles will sink into the bottom first to block the filter paper because they are saturated with water. Therefore, Qianjie believes that in conventional brewing plans, try to minimize the use of water columns with excessive penetration force (height above 7cm).

In contrast, when the water column is low or close to the liquid surface, the penetration force is softer. Firstly, because the effect of rolling the coffee powder layer is not so obvious, it is easy to extract insufficient. Secondly, because the water level is too low, the water column produces an outward arc and directly breaks through the powder wall, resulting in uneven extraction.

This kind of situation is often caused by novices. It is recommended to keep the distance between the water injection point and the liquid surface at at least 2 to 3 cm, and then match it with a moderately large water flow.

2. When the hot water flows out of the hand-flushed pot, the temperature will continue to decrease with the exposure time and area in the air. When high-level water injection is used, the surface area of the water column exposed to the air increases, and the faster the temperature loss rate, the lower the actual temperature entering the extraction will be, and the coffee concentration will also decrease accordingly.

For this situation, the most common way is to use a large filter cup to brew a small amount of powder (such as 15g of coffee powder for 3 to 4 people). Because the filter cup is too high, the hand-brewed spout has to be raised., making the hot water lose temperature greatly, and it is easy to touch the edge of the filter cup, making it more difficult to inject water.

Adjust the water injection height according to the characteristics of coffee beans

For medium and light roasted coffee, especially single products produced at high altitudes, because of the high density of the beans, the aroma tends to be elegant, bright and flexible. In addition to matching the high water temperature and fine grinding used in Qianjie, it can be appropriately improved. The water injection height of the middle extraction can be appropriately increased to obtain more flavor substances that provide a sweet and sour taste.

It's like the front street with fruity flavors. Huakui, we will divide the water into three sections. The first section will be filled with water at a height of 3 - 5cm and steamed. After steaming, the second section will be raised to a small water flow of 5 - 7cm and injected in circles. The last section will be returned to 3 - 5cm to inject the remaining water. The front street extracted in this way. Huaquai clearly highlights the aroma of mango and honey and the sweet and sour taste of orange.

Medium to deep roast coffee, because it takes longer to heat, the interior texture is loose, and it usually smells scorched and has a strong taste. Qianjie will use coarse granulated sugar, low water temperature and slow filter cups for extraction. In terms of technique, in order to improve the sweetness of the coffee, the water injection height in the last paragraph will be reduced.

Naqian Street. For example, the Queen's Manor in Brazil is still divided into three stages. The first section is steamy and the second section are kept at a height of 3 to 5 cm and injected in circles with medium water flow. In the third section, the water injection point is lowered to 2 cm and injected in small circles with small water flow. The remaining amount of water is finished. Finally, Front Street. The body of Queen's Manor has become thicker, sweet and clear, and the aftertaste of nuts has become more lasting.