Authorized Partner Under : Concrete Waterproofing Systems(CWS) For Life. CWS100 & CWS ADMIX. Waterproofing Systems for Life of concrete structure.  We have combined with offices in the United States, UK, Australia, German and Brazil. CWS are committed to achieving a leak free solution for the life of your structure – every time. And at a competitive price. Our products have been used for over 30 years with projects in Europe, the Middle East, Asia, Australia and the Americas.