Rockwool is light, compact and relatively inexpensive. It has a large water retention capacity and contains much air. Yet it is true that Rockwool for a tropical plant, knows its operating instructions. Most of the growers grow too wet. This reduced the consumable EC. That's fine for a growing plant, but not for a blooming one.
The PH value of Rockwool is quite high, around 8. With Rockwool it is important to wett the Rockwool well with water of a low pH (5.1 to 5.5), especially as the rockwool has the tendency to increase the pH inside the Slab PH. Make sure that the PH never falls below 5, you plant can take it, but the Rockwool does not. It will lose its elasticity and collapse. If you treat your Rockwool good, it is relatively long lasting.
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