At the bottom of a glass of wine or bottle you may find grainy sediment like coffee grounds. Sediment is leftover from the winemaking process, and it’s usually a sign that there was minimal intervention in the process by the winemaker to improve the wine. While sediment is harmless, it doesn’t taste particularly enjoyable. Older bottles tend to have more sediment than younger ones. Decanting a bottle will help remove sediment, especially if you use a filter with your decanter.