Grodan Gro-Block Improved GR5.6 Large with Hole, 3" x 3" x 4" - Case of 256 Select Rockwool Type:GR22 Jumbo w/ Hole 6"x6"x4" - Case of 64 Repeat application 2-3 times 10

Repeat application 2-3 times 10 days apart

000 watt lights

Each unit is a pack of 25 packs

The mesh size is made up of how many holes are in a square inch of screen

The plant and planet healthy solution you have been looking for

Grodan Gro-Block Improved GR5.6 Large with Hole, 3" x 3" x 4" - Case of 256 Select Rockwool Type:GR22 Jumbo w/ Hole 6"x6"x4" - Case of 64 Repeat application 2-3 times 10New 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