Grodan Gro-Block Improved GR4 Small with Hole , Unwrapped, 3" x 3" x 2.5" - Case of 384 Select Rockwool Type:GR7.5 Medium w/ Hole, 4" x 4" x 3" - Case of 192 Then add MS nutes and

Then add MS nutes and hormone liquid

such as with odor or water

dosing pumps and water manifold are all conveniently mounted on a stainless steel back panel simplifying installation and providing a clean appearance

Great for ultra pure drinking water

Grodan Gro-Block Improved GR4 Small with Hole , Unwrapped, 3" x 3" x 2.5" - Case of 384 Select Rockwool Type:GR7.5 Medium w/ Hole, 4" x 4" x 3" - Case of 192 Then add MS nutes andNew and improved stone wool substrate with advanced wetting technology from Grodan Introducing Grodan Gro Blocks Improved, a product specifically engineered to deliver real results for your crops, developed by plant scientists, researchers, and top growers. A core component of the "Precision Growing" philosophy, Grodan Gro Blocks Improved with Advanced Wetting Technology allow you to cultivate more uniform and high quality crops while using less water