Grodan Gro Block Improved GR6.5 Small 4" w/Hole, 4" x 4" x 2.6" Strip - Wrapped (Case of 36 Sleeves) HYSHIELD constant water pressure in your

constant water pressure in your hydro pump system across several rooms and installations

optimum air exchange and high cation exchange capacity (CEC)

RapidStart helps plants develop strong root networks

place a hole in your distribution line using a hole-punch and insert the barbed end of the connector

Grodan Gro Block Improved GR6.5 Small 4" w/Hole, 4" x 4" x 2.6" Strip - Wrapped (Case of 36 Sleeves) HYSHIELD constant water pressure in yourGrodan 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 physical properties for crop uniformity, more