Whisky - Chemistry - Chill Filtration

Chill Filtration

Whisky is often "chill filtered": chilled to precipitate out fatty acid esters and then filtered to remove them. Most whiskies are bottled this way, unless specified as unchillfiltered or non chill filtered. This is done primarily for cosmetic reasons. Unchillfiltered whiskies will often turn cloudy when stored at cool temperatures or when cool water is added to them, and this is perfectly normal.