Concrete is porous and if not waterproofed properly, water ingress can cause cracks and waterborne contaminants, deterioration. Real waterproofing of concrete would imply, preventing water passage and resisting hydrostatic pressure (due to pressure of stored water). This can be done by waterproofing from the positive (exterior), negative (interior) sides or from within the concrete itself (integral system).Crystalline-based systems typically come in a dry, powder form and are hydrophilic in nature. Unlike their hydrophobic counter-parts, crystalline systems actually use available water to grow crystals inside concrete, effectively closing off pathways for moisture that can damage concrete. They block water from any direction because the concrete itself becomes the water barrier.