https://www.baristainstitute.com/inspiration/coffee-and-water-how-use-high-quality-water-brew-best-coffee
其實一般嘅水ph 都係 7...
Standards for high quality water
Most waters worldwide are too high both in carbonate hardness and in total hardness. Treatment needed, that is!
SCA (Speciality Coffee Association) standards for minerals:
total hardness of 50-175 ppm CaCO3 (2,9-9,8 dH°)
carbonate hardness of 40-75 ppm CaCO3 (2,9-9,8 dH°)
total hardness should exceed carbonate hardness
pH of 6,5-8
(ppm equals here mg/l)
All this is to be studied based on the composition of the water in hand. Also, low brew ratios (for example espresso compared to filter coffee) shift the optimum of total hardness and carbonate hardness towards higher values. There are no exact numbers and ratios to be given!
What about pH of the water?
Basically water is neutral meaning it is of pH 7.
However due to different molecules dissolved in water, it can also be slightly acidic or alcalic. As a result, regular drinking water in Europe can have pH ranging from ≥ 6,5 and ≤ 9,5.
根住去在google 香港 水嘅硬度
香港食水中鈣和鎂的含量偏低,過去一 年食水的總硬度值( 以碳酸鈣計) 為每公升5 – 6 8 毫克* , 所以屬軟水為主。 若總硬度值大於 1 2 0 ,則普遍歸類為硬水。
所以香港水喉水算係幾啱沖啡
全要係chlorine 多d 所以我通常都用隔夜水去煲
外國有D地方係超硬水
真係唔知點算