Cardhu's production process begins with the careful selection of high-quality ingredients, primarily malted barley, yeast, and water sourced from the nearby Spey River. The barley is mashed in large vessels, allowing for the extraction of fermentable sugars. The resulting mash is then transferred to fermentation vessels, where yeast is added, and an alcohol-rich wash is produced over several days.
Following fermentation, the wash is distilled twice in traditional copper pot stills, a process that allows for precise control over the spirit's character. The first distillation occurs in the wash still, where the alcohol content begins to rise. The liquid is then transferred to the spirit still for the second distillation, separating the high-quality spirit from impurities. The heart of the distillation is carefully collected, which will become Cardhu's signature whisky.
Once distilled, the spirit is matured in a mix of ex-bourbon and ex-sherry casks for a minimum of 12 years. This ageing process is crucial as it allows the whisky to absorb flavors from the wood while developing complexity and depth. The final spirit is then blended to achieve consistency in flavor and bottled, embodying the rich heritage and craftsmanship of Cardhu.