Rockwool as hydroponic substrate: soak 24h in pH 5.5 solution, never allow to dry out completely and monitor EC buffer for optimal nutrient uptake.
Reduce Rockwool pH value: Soak in pH 5.5 solution for 24 hours. Never allow to dry out completely, avoid waterlogging. Seedlings: small cubes, vegetative: medium blocks, flowering: large mats. Note EC buffer - Rockwool stores nutrients. Disposal problematic - not compostable, hazardous waste.
Rockwool should be soaked in a pH 5.5 solution for 24 hours to stabilize the pH level and optimize nutrient uptake.
Rockwool should never be allowed to dry out completely; it is important to check the moisture level regularly and water it as needed.
An EC value between 1.2 and 2.0 is ideal for ensuring that the plants can absorb sufficient nutrients.