Concrete waterproofing admixture in powder form added during concrete preparation forming insoluble crystalline compounds. Improves water impermeability and does not affect vapor permeability of concrete. Remains permanently active. Withstands positive and negative hydrostatic pressure equally well. Suitable for waterproofing foundations, basements, tanks etc. Certified according to ELOT EN 934-2: T9 and classified as a water-resisting concrete admixture. CE marked.