Water KH

What it is and what sets it apart: KH usually tracks brew-water alkalinity. Not GH. Higher KH rounds acidity; lower keeps it brighter.

How it’s used or measured: Measure with a KH drop kit. Tune bicarbonate/buffer salts. Log ppm with GH.

Flavours and cup impact: Low KH: bright or sharp; high: softer or muted. Benefit: decide bean vs water acidity.

Technical notes: At home KH ≈ carbonate alkalinity (see Alkalinity).

Common mistakes: Equating KH with GH. Buffering away all acidity. Using pH alone.