Grodan Improved GR40 Uniblock 8" x 8" x 4" (Case of 36) Grow Tents Absolutely no tools required

Absolutely no tools required

Use within 2 years of purchase

Our optics also exceed international drop ball test standards

Up to 8 on/off cycles per day

That’s why they offer a 5-year warranty on this product--so you can grow with confidence

Grodan Improved GR40 Uniblock 8" x 8" x 4" (Case of 36) Grow Tents Absolutely no tools requiredGrodan Improved Uniblock GR40, 8" x 8" x 4" 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 optimal fiber structure and