What kind of water do you use to make coffee? should a water purifier or softener be installed in a good coffee shop?

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To brew a good cup of coffee, it takes more than just the selection, roasting and brewing of coffee beans. 99% of the coffee poured into the coffee cup is "water." from this point of view, the Academy of Water Sciences says that whether the coffee is delicious or not is the secret key. When it comes to the nature of water, there are all kinds of bottled water on the market in recent years, and people often hear words such as "hard water" and "soft water" in their daily life. In fact, according to the hardness of water, water is roughly divided into hard water and soft water. The so-called hardness of water refers to the total concentration of calcium and magnesium ions in water. When the concentration is low, soft water is called hard water. On the contrary, the higher concentration is called hard water. For example, the tap water or groundwater in Japan is almost all soft water, compared with Europe and the United States and other places are mostly hard water. There is no definite answer as to which is more suitable for brewing coffee, hard water or soft water, but the mineral content in the water does affect the taste of the water. Generally speaking, water with too much or too little minerals is considered to be unbalanced water quality. It is assumed that the high content of calcium and magnesium ions will hinder the extraction of caffeine, high-quality tannic acid and other main ingredients of coffee. On the other hand, if the water quality with high hardness is high, its effect will be directly reflected in the bitterness of coffee.