Grodan Gro-Block Improved GR7.5, 4" x 4" x 3" (Case of 192) featured 35% H2O2 is a strong

35% H2O2 is a strong oxidizer and must be handled with care

Features the CLOUDLINE inline fan with a PWM-controlled EC motor for quiet and energy efficient ventilation

Double ended metal halide lamps are not designed to be run for 24 hours a day

Convenience and Portability: The light fixture sports a foldable design for easy transportation and compact storage

Grodan Gro-Block Improved GR7.5, 4" x 4" x 3" (Case of 192) featured 35% H2O2 is a strongGrodan Gro Block Improved GR7. 5 Medium with Hole, 4" x 4" x 3" Case of 192 New 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. The uniform distribution of water and nutrients throughout the block allows for more efficient use of the entire