Containers made of this material are considered an alternative to wood or steel for the fermentation and storage of wines. The conventional concrete containers are lined on the inside with glass tiles or stainless steel sheets, less often with plastic or coated with paints. The advantages are optimal space utilization, flexible voluminas and less loss, Since the mid-1990s, experimenting with egg-shaped concrete containers, starting in France and then in Spain and now also in Germany. In the German wine-growing region of Franconia some "winemakers" with a volume of 900 liters are in use.
As with wooden barrels, there is little contact with oxygen what about with micro-oxygenation is to be compared. To prevent the acidic wine from reacting with the cement surface, the containers inside are treated several times with tartar paste before being filled. Compared to wood, an undesirable wood tone ( toast flavor ) avoided. Due to the unusual shape, the wine is constantly in circulation; there is no blind spot. The wines developed in it allegedly have more intense flavors on. Similar results are achieved with granite containers. Such containers are often used for Orange Wines used. See also below fermenter,