Containers made of this material are used as an alternative to wood or steel for the fermentation and storage of wines used. The conventional concrete containers are mostly lined with glass tiles or stainless steel sheets, less often with plastic or coated with varnish. The advantages are optimal use of space, flexible volumes and less loss, Since the mid-1990s, egg-shaped concrete containers have been experimenting in France and then in Spain and now also in Germany. In the German wine-growing region of Franconia, such "concrete eggs" with a volume of 900 liters are used by some winegrowers.
As with wooden barrels, there is little contact with oxygen what about with micro-oxygenation is to be compared. To ensure that the acidic wine does not react with the cement surface, the inside of the containers are treated several times with tartar paste before filling. In the case of 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 supposedly show more intense flavors on. Similar results are achieved with granite containers. Such containers are often used for Orange wines used. See also under fermenter,