Clayver is made of a special type of highly consistent compact sandstone, similar in many ways to natural granite. Unlike terracotta, it is very tough, which makes it easier to handle.  The material is waterproof and therefore no special provisions are necessary to prevent the evaporation of the liquid, such as wax, enamel or resin coating. The material is naked. The intrinsically micro-porous structure of the ceramic material allows gas exchange with the exterior, but only in limited quantity and over a long time. Hence, the container is also suitable for long ageing.
It is also food-grade according to current regulations.
Unlike uncoated cement containers, cleaning Clayver is very simple. Hot water, steam or concentrated solutions of tartaric acid, citric acid, etc. may be used.