Grodan Par22.5 Jumbo Block 6 in x 6 in x 4 in w/ Hole (Pallet of 704 loose blocks) Hydrofarm the Trolmaster ECS-9 RJ12 to

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Grodan Par22.5 Jumbo Block 6 in x 6 in x 4 in w/ Hole (Pallet of 704 loose blocks) Hydrofarm the Trolmaster ECS-9 RJ12 toGrodan Pargro Jumbo Block 6x6x4 Stone Wool Growing Media Built from basalt derived stone wool, the Grodan Pargro Jumbo Block provides a consistent, inert substrate that wont lock up or release nutrients, giving growers full control over feed strength and EC. Each pre drilled hole speeds transplanting from starter plugs, while the black white foil wrap promotes quick, balanced drainage with moderate water holding capacity. Pargros rapid water