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Waterproof 4
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even if the knobs are accidently bumped
5’ LHT525 - 2
Grodan Expert Slab 15/75, 40" x 6" x 3" Blue Lab Waterproof 4Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different types of fibers. The purpose is to support the requirement of the plant in the different plant stages. Grodan has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen
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