Chill Filtration

Chill filtration (koldfiltrering) is a filtration method used on whisky at low temperatures to remove fatty acids and other fat-soluble compounds that can cause cloudiness when chilled or when in contact with water and ice. The method is primarily used to improve clarity and stability in the final product, particularly in mass-produced whiskies.

Formål

• Ensure clarity at different temperatures and when pouring with water or ice
• Prevent clouding resulting from fat-soluble substances
• Remove components that can affect mouthfeel and texture

Proces

• Whisky is cooled to around −4 to 0 °C (some distilleries operate at 0–5 °C, depending on the desired balance)
• The liquid passes through a filtration medium (typically cartridge- or plate filtration) that captures fats, fatty acid esters, and other particles
• The filtered liquid is tested for clarity and stability before bottling

Effekter og overvejelser

• Clarity improves, and haze with water or ice is reduced
• The mouthfeel and texture can be muted in some whiskies, especially if there are many fat-soluble compounds
• Some producers choose to avoid chill filtration to preserve natural oils and a more pronounced mouthfeel and aroma

Variationer og kontekst

• Not all whiskies require chill filtration; smaller batches or special releases may choose to skip the process
• Non chill-filtered whiskies are often marketed as better for expressing character and texture, but can be more prone to clouding under certain serving conditions