In hydro, most important thing to take into account is water quality. You want to give your cannabis clean and properly pH-balanced water with sufficient nutrients.
Proper EC value of nutrient solution depends on type of strain you’re growing and phase is at, but values between 0.8 and 1.2 are suitable for all phases.
These values indicate amount of nutrients dissolved in water per liter (mg/l).
You can lower pH by adding phosphoric acid or raise it by adding potassium carbonate or sodium bicarbonate.
Troubleshooting Common Issues:
Diseases and pests
Nutrient deficiencies
Temperature and humidity issues