Grodan Gro Block Improved GR10 Large 4" w/Hole 4" x 4" x 4" Shrink wrapped/Strip, (case of 144 blocks) Organic Dry Nutrients 000 cu ft (0

000 cu ft (0

This takes the  takes the guess work out of litmus paper

Simply insert the 1/4" tubing into the barbed ends of the fitting

Its precisely engineered design features an inner diameter of 3/16" and an outer diameter of 1/4"

- Heavy-duty 5ft hose

Grodan Gro Block Improved GR10 Large 4" w/Hole 4" x 4" x 4" Shrink wrapped/Strip, (case of 144 blocks) Organic Dry Nutrients 000 cu ft (0Grodan Gro Block Improved GR10 Large 4" w Hole 4" x 4" x 4" Shrink wrapped Strip, (case of 144 blocks) Product Details Grodan Improved Gro Block Improved GR10 Large 4" w Hole 4" x 4" x 4" Shrink wrapped 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