The sun heats concrete and asphalt in cities immensely. And heavy rainfall occurs frequently, which pushes sewer systems to their limit. Pervious concrete is coarse-grained and contains many cavities, allowing rainwater to drain away more easily. ETONIS®, a concrete admixture developed by WACKER, allows manufacturers to produce a particularly robust grade of pervious concrete offering exceptional protection from freeze-thaw cycles and from chemicals dissolved in water.