Grodan Gro-Block Improved GR5.6 Large with Hole, 3" x 3" x 4" (Case of 256) AIR FILTER BOXES This avoids plant stress and

This avoids plant stress and significantly reduces the risk of airborne fungi

Filters iron

Nordic Pure 24x24x4 Pleated Air Filters MERV 10 are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home

8H (CS) Barcodes 5744005020018 (EAN-13)638104029902 (UPC-A) Shipping Weight 0

delivering healthy

Grodan Gro-Block Improved GR5.6 Large with Hole, 3" x 3" x 4" (Case of 256) AIR FILTER BOXES This avoids plant stress andGrodan Gro Block Improved GR5. 6 Large with Hole, 3" x 3" x 4" (Case of 256) 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