Input lever
Water Chemistry
Detail panel
Water source
The base water used for brewing.
AeroPress Wheel Variable
Calcium
Water Chemistry · Input lever
A hardness ion commonly present in brewing water.
Input lever
Water Chemistry
Advanced detail
Technical science
Competition practice
Definition
Calcium is one component of water hardness and is sometimes tuned directly in custom water recipes.
Why It Matters
Calcium contributes to extraction structure and can shape the feel of the water differently from magnesium.
Page Context
Calcium is part of the Brew Supply AeroPress Wheel and helps brewers describe a hardness ion commonly present in brewing water.
Related variables
Input lever
Water Chemistry
Wheel face
Water recipe
A deliberate mineral recipe added to low-mineral water.
Input lever
Water Chemistry
Wheel face
Water TDS
The total dissolved solids of the brew water.
Input lever
Water Chemistry
Wheel face
Hardness
The calcium and magnesium load that drives brewing hardness.
Input lever
Water Chemistry
Wheel face
Alkalinity
The water’s buffering capacity, often driven by bicarbonate.
Input lever
Water Chemistry
Advanced detail
Magnesium
A hardness ion commonly used in custom brew-water recipes.
Affected outcomes
Measured metric
Cup Outcome
Wheel face
Beverage TDS
Measured total dissolved solids in the served beverage.
Calculated metric
Cup Outcome
Wheel face
Extraction Yield
Calculated percentage of coffee mass extracted.
Measured metric
Cup Outcome
Wheel face
Beverage Yield
The liquid beverage mass collected or served.
Cup outcome
Cup Outcome
Wheel face
Aroma
The smell of the brewed coffee.