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Grodan Gro-Block Improved GR10, Tall (White Foil), 4" x 4" x 4", 1584 Blocks Loose on Pallet | direct from Growers House
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Amazon.com : GRODAN A OK Rockwool Stonewool Hydroponic Grow Media Starter Cubes Plugs - 1.5" x 1.5" - Sheet of 98 : Patio, Lawn & Garden
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