The non-alcoholic version of Coopers Ginger Beer only undergoes a single ferment. This ferment occurs in the bottle while the fermenting tub is used only for mixing the brew. The ferment in the bottle serves to carbonate the brew. Of course, with any fermentation, some alcohol is produced (approx 0.7% ABV) but not enough to be considered as an alcoholic beverage (< 1.15% ABV). Being a primary fermentation, there will be a small deposit around the fill line of the bottle as well as the normal sediment at the bottom.