Water for Coffee
How water composition affects coffee extraction, taste, scale formation and brewing equipment.
Water is the extraction medium
Brew water is not just a neutral carrier. Dissolved minerals and alkalinity influence how water interacts with compounds in coffee.
Hardness
Hardness mainly reflects dissolved calcium and magnesium ions. These minerals can affect extraction and can also contribute to scale in heating equipment.
Alkalinity
Alkalinity describes water's capacity to neutralise acids. In coffee brewing, it can influence perceived acidity and the balance of extracted acids.
A practical principle
Extremely low-mineral water and very mineral-rich water can both create brewing problems. The useful target depends on coffee, recipe, equipment and local water.
Continue exploring
Green coffee
Follow coffee from plant and cherry through processing, drying, milling and storage.
Green coffee →Coffee chemistry
Explore the compounds and reactions that shape roasted coffee.
Coffee chemistry →Coffee extraction
Connect grind, water, temperature, time, concentration and extraction.
Coffee extraction →Coffee Knowledge presents technical subjects as an educational reference. Terminology, grading systems and production practices can vary by country, producer, equipment and commercial context.