Grodan Stonewool is a proven hydroponics growing medium preferred by garden enthusiasts everywhere. This 36" x 8" x 3" Delta Expert Gro-Slab is perfect for "blocking on" smaller stonewool plugs and blocks to accommodate the final stages of plant growth. This single Delta Slab features vertically packed fibers for quick drainage and comes in a UV-resistant plastic poly sleeve to minimize algae formation.

Grodan stonewool is known for its quality, consistency and performance.