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Safer's Sulphur Dust controls and prevents black spot
Its porous nature allows it to suck up and hold onto moisture
and minerals
This combination of nutrients will lower pH over time while including the extra soluble calcium
Grodan IMPROVED Gro-Blocks 8"X8"X4" Uni-Block (GR40) filter Safer's Sulphur Dust controls andGrodan 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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