Grodan Gro-Block Improved GR22, Jumbo, 6 x 6 x 4, Case of 64 Nutrient Kits & Accessories This atmosphere oxidizes contaminants in

This atmosphere oxidizes contaminants in the air with friendly oxidizers

6 GPM Flow: Moves real volume for fast

and the double-ended architecture keeps light degradation lower over time

but it also features a built-in bucker

customizable air circulation that adapts to your plants' needs

Grodan Gro-Block Improved GR22, Jumbo, 6 x 6 x 4, Case of 64 Nutrient Kits & Accessories This atmosphere oxidizes contaminants inGrodan Improved Jumbo (White Foil) 6 x 6 x 4 (Case of 64) Keep it Real Real Science 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 our Advanced Wetting Agent. Real Improvement These leading