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Practically Non-Toxic— It meets the purity specifications in U
Waterproof Level
and water-saving way to water traditional small sized bonsai pots
The adjustable hanging straps and 3 duct clamps simplify the process of connecting the inline fan
Grodan Gro Block Improved GR6.5 Small 4" w/Hole 4" x 4" x 2.6" Strip king Practically Non-Toxic— It meets theDescription Product Details: Grodan Improved Gro Block Improved GR6. 5 Small 4" withHole, 4" x 4" x 2. 6" 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 Grodan's Advanced Wetting