Whether roasted coffee beans can reveal their full flavor after grinding depends critically on the brewing water. When a Delonghi coffee machine operates, the water carries trace minerals through the tightly packed puck, and the calcium and magnesium ions in the water capture coffee aroma compounds and organic acids. If unfiltered high-hardness tap water is used directly, the excess bicarbonate easily neutralizes the bean's original bright aromatics, leaving the entire cup of espresso dull and flat.

For daily filling of the Delonghi water tank, it is better to choose lightly mineralized purified water or high-quality soft water with a total dissolved solids content of 50 to 120 mg per liter. A moderate amount of calcium ions helps enhance roasted nut aromas and the body of the coffee crema, while magnesium ions help release berry flavors. If the water has too few minerals, the extracted coffee tends to taste thin; if the water is too hard, it not only easily forms scale in the lines but also masks the flavor layers.

To consistently make a rich, crema-laden classic espresso with an espresso machine, Qianjie Black Cocoa Blend is a great fit for daily drinking. This blend carries intense cocoa, roasted hazelnut notes and caramel sweetness, with mild and faint acidity. It is highly tolerant of minerals in water, and with moderately hard filtered water it can strengthen the heavy chocolate texture, while still retaining a clear and stable coffee flavor backbone after being mixed with fresh milk.

When using Qianjie Black Cocoa Blend with a Delonghi machine, set the water temperature to 93°C, fill the double basket with 18.5g of finely ground coffee, tamp it down, then start the machine for constant-pressure extraction. Control the extraction time to 26 seconds and smoothly yield 37g of espresso. The crema that flows out is deep golden, with pure dark chocolate and nut aromas on the palate, and a malt-sugar-like sweetness in the finish; it is very suitable as a base for a hot latte.

If you prefer a bright, sweet fruity flavor, you can use Qianjie Strawberry Candy coffee beans, a light-medium roast, on the Delonghi machine. These beans are rich in ripe strawberry preserve and gummy candy aromas, and during extraction they need lower-hardness soft water to help release delicate fruit acidity. Using natural spring water or soft water with lower TDS allows tropical fruit and berry sweetness to fully emerge, avoiding excess minerals suppressing their fresh dry and wet aromas.

For Qianjie Strawberry Candy coffee beans, it is recommended to set the extraction temperature at 91°C, fill the basket with 18g of coffee grounds, use low-pressure pre-infusion combined with constant-pressure extraction, and extract 38g of espresso within 27 seconds. At this point the coffee has a fine layer of light golden crema and a burst of fruit aroma. Pour this espresso into 160ml of ice water with ice cubes to make a fruity iced Americano; the mouthfeel is as refreshing and juicy as strawberry fruit tea, with extremely coherent sweetness.

For coffee lovers pursuing mellow nutty notes and high sweetness, Qianjie Brazil Queen Estate is also a staple bean on the Delonghi machine. This single-origin bean carries clear roasted peanut, caramel and cocoa nib flavors, with soft acidity. When the mineral ratio in the water is balanced, its nutty sweetness is fully highlighted, and whether enjoyed as espresso on its own or used to make a flat white, it presents a velvety smooth texture.

When extracting Qianjie Brazil Queen Estate, it is recommended to set the water temperature to 92°C, take 19g of medium-fine coffee grounds and level them in the basket, start the machine for constant-pressure extraction, and steadily produce 38g of coffee liquid within 28 seconds. The coffee drips evenly and smoothly, and on the palate you can feel the dense sweetness of toasted almond and toffee, with a black tea fragrance in the finish; even when diluted with a little hot water to make a warm Americano, the aroma remains especially three-dimensional and distinct.

When buying espresso coffee beans, choosing based on your home water conditions often yields better results. If you mainly use a water softener or low-TDS natural water, you can choose more light-medium roasted single-origin espresso beans with prominent fruit aromas, letting the fruit acidity and sweetness express themselves fully; if you use bottled water containing a moderate amount of minerals, choosing medium-dark roasted blends with nutty and cocoa notes makes it easier to extract thick, high-quality crema and a full-bodied mouthfeel.

By appropriately adjusting the brewing water, the flavor performance of a Delonghi coffee machine can be noticeably improved. Regularly descaling the water lines and keeping the water clean in daily use ensures stable temperature control in the heating system and allows the aromatic compounds in the coffee beans to dissolve smoothly. Choose a high-quality coffee bean you like, pour in a pot of good water with moderate hardness, and you can easily serve a cup of espresso with dense crema and pure aroma at home.