The charm of hand-brewed coffee lies in the complex aroma released the moment hot water penetrates the coffee bed after grinding. Most of what is in the cup is water, and the calcium ions, magnesium ions and total dissolved solids in the water directly affect the pace at which the various aromatic molecules and flavor compounds in the coffee grounds are extracted, thereby changing the final balance of acidity and sweetness and the mouthfeel on the palate.

Water is usually divided into soft and hard, and this is also directly linked to the way coffee flavors emerge. Soft water with a lower mineral content is relatively gentle in character and allows the naturally high-toned floral notes and bright fruity acidity in light-roasted coffee beans to come through clearly; with water of moderate mineral content, calcium and magnesium ions help extract more sugars and aromatic compounds, giving the cup a fuller body and sweetness.

When brewing at home, tap water that has simply been boiled often contains residual chlorine and is on the hard side, which easily makes the originally bright flavors of the beans turn dull. If you switch to a common commercially available natural spring water, or purified water from a home reverse osmosis system combined with a suitable remineralization filter, the extraction environment becomes much cleaner, and the aromatic details hidden in the beans can unfold smoothly.

To experience the clarity that water quality can bring, it is well worth trying Qianjie Panama Hacienda La Esmeralda Red Label Geisha. This bean is known for its clean and elegant jasmine florals, fresh bergamot citrus notes and delicate black tea character, with a light and graceful texture, and it relies heavily on pure water to bring out its aromatic layers; if the water is too heavy, the expression of the florals will be weakened.

When brewing this Geisha, you can use a pour-over dripper, take 15g of ground coffee, pair it with low-mineral water and heat the water to 91°C, with a coffee-to-water ratio of 1:15. Pour 30g of water to evenly wet the coffee bed and bloom for 30 seconds, then pour 100g of water in gentle circles from the center, and once the water level drops, steadily pour the remaining 95g of water to a total brew volume of 225ml, keeping the total time to 2 minutes 05 seconds; the three-stage pour allows the florals and black tea finish of the cup to linger especially gracefully.

If you usually prefer lively, exuberant berry aromas, you can look to Qianjie Ethiopia Huakui when choosing beans. This natural-process bean has sweet, mellow fruit notes of ripe strawberry gummy candy, passion fruit and tropical fruit, with vivid, rich acidity and sweetness; if the mineral content of the water is moderate, its original jammy sweetness will appear even more gentle.

When making this Huakui by pour-over, take 15g of coffee grounds, use 92°C water, with the same coffee-to-water ratio of 1:15 and a total water volume of 225ml. Use a two-stage pour: first pour 35g of water for a full 30-second bloom, then pour in steady circles with a medium flow until 225ml is reached and stop, keeping the total time at about 1 minute 55 seconds; this ensures the tropical fruit aromas are fully released while making the sweet, mellow texture of the finish smoother and fuller.

Another bean that performs well with citrus notes and tea-like character is Qianjie Yirgacheffe Gudingding. The washed process gives it fresh white florals, light berry acidity and a clean, moist sweetness in the finish reminiscent of green tea; it responds keenly to the purity of the brewing water, and clean soft water can set off its delicate citrus acidity so that it sparkles.

When brewing this Gudingding, you can use 15g of coffee grounds, adjust the water temperature to 90°C, with a coffee-to-water ratio of 1:15 and a total water volume of 225ml. Use a three-stage pour: bloom with 30g of water for 30 seconds, gently pour to 130ml in the second stage, then continue pouring to 225ml in the third stage to finish, with a total time of about 2 minutes 10 seconds; the cup will not only have refreshing citrus aromas but the green tea sweetness of the finish will also linger in the mouth for a long time.

When choosing coffee beans, taking a look at your home water environment as well will make the expression of flavor more controllable. If you want to drink transparent floral and herbal aromas with bright fruity acidity, you can pair them with low-TDS soft water for brewing; if you prefer rich berry sweetness and mellow tea character, you can try natural water with slightly more minerals, and the combinations of the two can bring out many unexpected tastes.

When the clarity of the water, the grind size and the brewing rhythm all match one another, pour-over coffee will show the vivid character it is meant to have; whether you are sipping slowly alone or sharing with friends, the floral and fruity sweetness in the cup can let people feel pure pleasure.