Grodan Gro-Block Improved GR7.5 Medium with Hole, 4" x 4" x 3" Strip

Introducing Grodan Gro-Blocks Improved with Advanced Wetting Technology, a new and improved stone wool substrate designed by plant scientists and top growers. Promoting the "Precision Growing" philosophy, this product offers more efficient use of water and nutrients, resulting in uniform and high-quality crops. Try it in your next grow for real results.