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Water is an indispensable element of a good cup of coffee. The purpose of this article is not to discuss which kind of water is the most suitable for brewing coffee, but to explore the effect of the type of water on the change of coffee taste.

. There are hard water and soft water.

Having good drinking water does not necessarily mean making good coffee, because the minerals in the water will affect the color and taste of the coffee. Generally speaking, too much or too little minerals will cause imbalance, and which kind of water to choose to brew coffee to get the best balance also varies according to individual taste differences.

When it comes to the types of water, it can be divided into hard water and soft water. The content of calcium ion or magnesium ion in water is converted to the content of calcium carbonate in each liter of water.

L), this number is the hardness of water. If the content of calcium carbonate is less than 100 tons / l, it is soft water, and if it exceeds it, it is hard water.

Almost all tap water and groundwater in Japan are soft water, while those in Europe are mostly hard water. However, which kind of water is most suitable for coffee cannot be simply summed up in one sentence.

However, if the water contains too much calcium or magnesium, brewing coffee will hinder the release of caffeine and good tannins. On the other hand, the bitterness of coffee is difficult to dissolve in low hardness water and easy to dissolve in high hardness water.

Even if the same water is used, the drinker will feel differently depending on the season, weather, place, time, and so on.

In other words, when brewing coffee, regardless of the hardness or temperature of the water, it has a considerable impact on the taste of coffee.

. Brew delicious coffee in tap water?

The first thing to note is that tap water contains chlorine for disinfection, so it smells like bleach. The chlorine odor can be reduced to a certain extent by boiling water, or more can be improved by adding a water filter with activated carbon.

If the water pipe is too old, rust may flow out with the water. if it contains too much iron, it will combine with the tannins of the coffee when brewing, resulting in the taste affected. Also, the water for brewing coffee had better contain carbon dioxide; for water that has been boiling for too long or boiled more than twice, there is almost no carbon dioxide left, so do not use this kind of water to make coffee.

. Hard water highlights bitter taste, soft water highlights sour taste

There is actually a difference of opinion on which is suitable for coffee, hard water or soft water.

For example, if you like coffee with a mild taste, you feel that coffee brewed in soft water tastes good; if you like coffee with a strong bitter taste, you feel that coffee brewed in hard water has a more obvious bitter taste.

In addition, between hard water and soft water, there is a medium hard water with moderate calcium content. The mineral water sold on the market includes hard water, soft water and intermediate hard water. Readers can drink it and compare the differences in taste.

In addition to brewing coffee, hard water, soft water and middle hard water also have their own suitable ways to use. As far as hard water is concerned, drinking during meals can make your mouth feel more refreshing, and it is also helpful for mineral supplements after exercise, calcium supplements for pregnant women, relief of constipation, and so on.

The Japanese are usually used as soft water for drinking water, which is most suitable for boiled soup and green tea in Kunbu and firewood fillets, as well as soft water when making tofu and noodles.

As for the middle hard water, in addition to cooking and cooperating with all kinds of dishes, you can also make good black tea.

To sum up, as far as brewing coffee is concerned, there is no reason to use what kind of water is necessary. It is the most suitable choice according to personal preference.