It may happen to taste a different flavour of coffee even drinking always the same brand and quality. Water can influence the taste of this popular beverage, since it is the 90% of the volume. Two cup of coffee, if prepared with different kind of water in ph and fixed residue can be totally different in taste. When water has an acid ph (lower than 7) it can ruin some metallic component of the coffee machine, while when the water has a basic ph (higher than 7) calcareous encrostation may occur. In addition, fixed residue can influence the quality of a cup of coffee. Fixed residue is the quantity of magnesium and calcium salts that water leaves after evaporating: if it is between 50 and 500 mg/l it is called oligomineral, the most common in Italy.
So which is the best water for our coffee?
Definitely, the water with a not too acid ph and a middle fixed residue is the best one for our coffee. Many people suggest to use bottle water, other prefer water from the tap, which on the other hand may contain too much chlorine. If the water from your tap contains the right amount of substances, it will not ruin the taste and the foam of your coffee.
According to the experts to get a good coffee the best water has to have between 12,5 and 14,5 point in hardness, a fixed residue between 75 and 250 mg/l, calcium between 17 and 85 mg/l, sodium under 10 mg/l and ph between 6,5 and 7,5. It is important to know the characteristic of the water you get at home and here you can find the ones of the 20 most important cities of Italy. If the water of your city does not have the previously indicated characteristics, we suggest you to use bottle water, always having a look at label. Never use sparkling water since carbon dioxide can influence the taste of your coffee.