Xypex Concentrate is the most chemically active product within the Xypex Crystalline Waterproofing System. When mixed with water, this light grey powder is applied as a cementitious slurry coat to above-ground or below-ground concrete, either as a single coat or as the first of a two-coat application. The Xypex technology diffuses and reacts with the pre-application moisture-conditioned concrete, creating the Xypex formation within the existing concrete structure.