Costar Anti-Wash Admixture is a ready to use, liquid admixture specially developed for concrete placed underwater. The Anti-washout admixture is substantially influential in enhancing the cohesiveness of concrete that is poured underwater and in danger of washout or segregation due to surrounding water, leading to greater uniformity of hardened properties. Costar Anti-Washout admixture is ideal for all concrete pumped underwater where thixotropic properties are required.