Grodan Gro Block Improved GR10 Large 4" w/Hole 4" x 4" x 4" Strip, (case of 144 blocks) water-pumps-&-irrigation-supplies * Temperature control (+/- 1°

* Temperature control (+/- 1° F)

The OA6-24 control board is designed to control multiple 24vac solenoid valves

While calcium and magnesium ions are easy for a plant to uptake

enhanced with potent botanical extracts

–No replacement parts

Grodan Gro Block Improved GR10 Large 4" w/Hole 4" x 4" x 4" Strip, (case of 144 blocks) water-pumps-&-irrigation-supplies * Temperature control (+/- 1°Grodan 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