Calcium Chloride Flakes (CaCl₂) - Brewing Water Treatment & Mineral Addition
Calcium Chloride (CaCl₂) flakes are a food-grade brewing water mineral used by homebrewers to build and fine-tune the mineral profile of their brewing water with precision and repeatability. Highly soluble and fast-acting, these flakes dissolve completely in strike water, sparge water, or directly in the mash — delivering an immediate and measurable increase in both calcium and chloride ion concentrations that shapes the flavour, mouthfeel, and fermentation character of the finished beer.
What makes calcium chloride one of the most frequently used brewing salts is its powerful effect on two of the most important sensory dimensions in beer. The calcium ion (Ca²⁺) supports a healthy mash enzyme environment, promotes yeast health and flocculation, reduces beer pH, and improves clarity and stability in the finished beer — making it the single most important mineral addition in most water treatment scenarios. The chloride ion (Cl⁻) accentuates malt roundness, softness, and perceived fullness in the mouthfeel — the opposite effect of sulfate, which drives dryness and bitterness. A higher chloride-to-sulfate ratio builds the soft, round, malt-forward character of styles like hazy IPA, English Bitter, Märzen, and Czech Pilsner, while a balanced ratio suits a wide range of everyday styles.
Used alongside calcium sulfate (gypsum), magnesium sulfate, and sodium chloride, calcium chloride flakes give homebrewers the granular control over water chemistry that makes it possible to brew to style rather than just to recipe.
Flake form
Supplied as hygroscopic flakes that dissolve quickly and completely in cold or warm brewing water. Store in an airtight container with desiccant to prevent caking and moisture absorption.
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Key Features
• Food-grade calcium chloride (CaCl₂) in fast-dissolving flake form
• Dual mineral contribution — calcium (Ca²⁺) and chloride (Cl⁻) ions
• Accentuates malt softness, roundness, and mouthfeel fullness
• Supports mash enzyme activity, yeast health, and beer clarity
• Lowers mash and beer pH — essential for water profile building
• Hygroscopic flake form — store airtight with desiccant
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Usage
Best suited for: Malt-forward water profiles, soft and round mouthfeel styles, hazy beer mineral builds, general calcium supplementation across all styles
Typical styles: Hazy/NEIPA, Czech Pilsner, English Bitter & ESB, Märzen, Dunkel, Stout, Porter
Dose: Add to strike water or mash according to target water profile. Always calculate additions against your base water report using brewing software.
Note: Store in an airtight container — calcium chloride flakes are highly hygroscopic and will absorb atmospheric moisture and cake if left unsealed.
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Quick facts
Product: Calcium Chloride
Chemical formula: CaCl₂
Form: Flakes
Ion contribution: Calcium (Ca²⁺) + Chloride (Cl⁻)
Use: Water chemistry adjustment, malt accentuation, mash pH, yeast health, beer clarity