HydroBlend tennis court surfacing material is used to build, resurface and maintain Har-Tru courts with below ground, subsurface irrigation systems, including HydroCourt, HydroGrids and Cal-Cap. Hydroblend is made from a billion-year-old Pre-Cambrian metabasalt stone found in the Blue Ridge Mountains of Virginia. It is a natural green stone that is extremely hard and angular, two very important qualities when it comes to tennis court construction. The angularity helps the stone particles lock together to form a stable playing surface and the hardness provides exceptional durability. The natural dark green color is classically clay and instantly recognizable. You can purchase Hydroblend from 10-S Tennis Supply in 80 lb., 50 lb. bags or bulk bags for contractors. Please call for pricing.