Water Minerals for Brewing

The Invisible Ingredient

Water minerals are invisible in the glass but profoundly affect every aspect of the brewing process and finished beer. Here is what each major ion does and how to adjust it.

Calcium (Ca)

Range: 50-150 ppm

Calcium is the most important brewing mineral. It lowers mash pH, promotes enzyme activity, aids yeast flocculation, improves beer clarity, and enhances flavor stability. Calcium is added via gypsum (calcium sulfate) or calcium chloride, depending on whether you want to boost sulfate or chloride simultaneously.

Magnesium (Mg)

Range: 0-30 ppm

A yeast nutrient in small amounts. Above 30 ppm, magnesium contributes a harsh, astringent bitterness. Most malt provides sufficient magnesium for yeast health, so additional supplementation is rarely needed.

Sodium (Na)

Range: 0-75 ppm

Low levels (10-40 ppm) round out malt character and add a perception of fullness. Above 75 ppm, sodium creates a salty, minerally taste. Above 150 ppm, it becomes unpleasant. Avoid adding sodium to hop-forward beers, where it can accentuate harshness.

Sulfate (SO4)

Range: 0-350 ppm (up to 600+ for Burton ales)

Sulfate accentuates hop bitterness and produces a dry, crisp finish. High sulfate water creates the assertive, minerally hop character of Burton-on-Trent pale ales. For IPAs, a sulfate level of 150-300 ppm is common. For malt-forward styles, keep it below 50 ppm.

Chloride (Cl)

Range: 0-150 ppm

Chloride enhances malt body, roundness, and perceived sweetness. It produces a fuller, smoother mouthfeel. High chloride water suits stouts, brown ales, and malt-forward lagers. For hop-forward styles, keep chloride moderate to avoid muting hop character.

Bicarbonate (HCO3) / Alkalinity

Range: 0-250 ppm (depends on grain bill)

Bicarbonate buffers acidity and raises mash pH. Dark malts naturally lower pH, so styles like stout and porter benefit from some bicarbonate to prevent overly acidic mashes. Pale beers need low bicarbonate water — excess bicarbonate makes pale beers taste harsh and muddy.

The Sulfate-to-Chloride Ratio

This ratio is a practical tool for adjusting perceived beer balance:

• 3:1 or higher (SO4:Cl) — dry, bitter, hop-forward
• 1:1 to 2:1 — balanced
• 1:2 or lower — round, malty, full-bodied

Adding Minerals

Use food-grade brewing salts:

• Gypsum (CaSO4) — adds calcium and sulfate
• Calcium chloride (CaCl2) — adds calcium and chloride
• Epsom salt (MgSO4) — adds magnesium and sulfate (use sparingly)
• Table salt (NaCl) — adds sodium and chloride (rarely needed)
• Chalk (CaCO3) — adds calcium and carbonate (dissolves poorly; better to use baking soda or acid adjustment)

Practical Workflow

1. Get your source water report
2. Enter values into brewing software (Bru'n Water, Brewfather)
3. Choose a target profile matching your style
4. Calculate and add salts to the strike water
5. Verify mash pH with a calibrated meter