Rockwool Gro-Slabs 6 in x 36 in x 4 in
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Grodan Stonewool is a proven hydroponics growing medium preferred by garden enthusiasts everywhere. This 36" x 6" x 4" Delta Slab is perfect for "blocking on" smaller stonewool cubes and blocks to accommodate the final stages of plant growth. Slabs feature vertically packed fibers for quick drainage and come in a UV-resistant plastic poly sleeve.