Grodan Gro-Block Improved GR10 Large with Hole, 4" x 4" x 4" (Case of 144) leds Coverage and Flow Rate: This

Coverage and Flow Rate: This product puts out 11 gallons per minute for a quick

Eliminates micronutrient-destroying chlorine and chloramines from water thereby allowing the microbiology of the soil to convert minerals into nourishment for plants

Fire Point ASTM D92 263°C

Heavy-Duty steel construction with spiral fan guards

Industrial Heavy Duty Zippers (designed for light elimination)

Grodan Gro-Block Improved GR10 Large with Hole, 4" x 4" x 4" (Case of 144) leds Coverage and Flow Rate: ThisGrodan Gro Block Improved GR10 Large with Hole, 4" x 4" x 4" Case of 144 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 substrate