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Grodan Gro Block Improved GR10 Large 4" w/Hole 4" x 4" x 4" Strip, (case of 144 blocks) Master Controller The ONA odor neutralizing agentsGrodan Improved Gro Block Improved GR10 Large 4" w Hole 4" x 4" x 4" Strip Grodan partnered with the Wageningen University and Research facility in The Netherlands and top growers throughout North America to identify the optimal stone wool substrate and irrigation strategies for specialty crops. The result of months of scientific research and trials is Grodan Gro Blocks Improved with Grodans Advanced Wetting Agent. These leading edge blocks have the