Concrete lithium hardeners are used to thicken, harden and protect new (freshly seasoned) and existing floorings from dust. Active lithium is the main component of such hardeners. It makes chemical reaction with concrete components, thanks to which the surface is sealed, harder, with reduced dusting. This significantly facilitates the maintenance of concrete floors. Preparations based on lithium silicate, unlike sodium silicate, do not peel off. One of the leading manufacturers of hardeners for concrete and marble is Ultralit. When choosing an impregnation for concrete, content of lithium silicate should be detected in the product. Poor quality concrete floors require usage of preparations with a higher content of lithium silicate. With good quality floor coverings, the concentration of lithium silicate can be reduced.