Tag: demineralised

Drinking-water science says demineralised water is a bad idea — flat-tasting, mineral-poor, and corrosive to pipework. Regulators agree, and several set a minimum mineral content for treated drinking water. So why does every serious proofing specification run in the opposite direction, toward zero? Because the water in a whisky bottle is not the water in a glass, and the arithmetic that governs one has almost nothing to do with the other.

A blending-water specification is a list of limits. A certificate of analysis is a list of claims that those limits were met. Between the two sits a set of standardised analytical methods — conductivity by a three-stage pharmacopoeial test, organic carbon by oxidation, trace ions by ICP-MS and ion chromatography, organisms by culture, and taste by a trained panel — each with its own blind spots. Here is what actually measures what, why two honest certificates can disagree, and the questions that separate an audited supplier from a confident one.

A water softener takes hardness to zero, and a lot of people read that as "the minerals are gone." They are not. Ion exchange swaps calcium and magnesium for sodium and leaves total dissolved solids, alkalinity, chloride, sulphate and silica exactly where it found them — while adding sodium and a chlorine demand of its own. Here is what a softener actually does to water, why that is the wrong answer for spirit reduction, and the one place it genuinely earns its keep in a blending-water plant.

Indian Made Foreign Liquor is the category that dominates the world's largest whisky market, and its standard recipe begins by cutting 96% neutral spirit down to 42.8% with demineralised water. That single step makes water the largest ingredient in the bottle by volume — and, because an ENA base carries almost no congeners to hide behind, the one with the least cover for a fault.

A whisky forgives a little calcium because there is nothing in the bottle for calcium to react with. A liqueur is not so lucky — it carries sugar, fruit acids and, in the cream category, a dairy protein emulsion that ionic calcium is known to coagulate. This is why liqueur producers buy demineralised water, and what happens when they do not.

In a whisky, water is the ingredient that has to disappear behind 40% ABV. In a 0.0% spirit there is nothing to disappear behind — no ethanol to carry aroma, no ethanol to suppress microbes, and in India a regulatory regime that swaps the distillery rulebook for the packaged-drinking-water one. This is what changes in the water specification when a distillery launches a no-alcohol expression.