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 Compatible with the XPOWER AP-1800D

Compatible with the XPOWER AP-1800D Portable HEPA Air Filtration System

supporting up to 1100W

such as with odor or water

Resinator OG & XL Drum Screen

Then add MS nutes and hormone liquid

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 Compatible with the XPOWER AP-1800DNew 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