Water Guard Crysta Admix 103 Water guard Crysta Admix 103 is a high quality, integral and high concentrated waterproofing admixture for concrete and mortars. By reaction with the cement paste it forms nanocrystals. In the cement matrix Water Guard Crysta Admix 103 is reducing the capillary and pore size. The formed crystal structure is not soluble. Water Guard Crysta Admix 103 forms in combination with concrete an integral waterproofing system for all concrete construction.