Gold Label Hydro is a professional grade mineral two component base plant nutrient for the vegetative and flowering phase on hydro substrates such as expanded clay pebbles (Gold Label RHP Hydrocorn #713750 & 713752) and rockwool. Add A & B in equal quantities, 0.5-3 ml/liter or until the desired EC. The chelated micro elements guarantee optimum availability in a wide pH range. Never combine pure nutrients together, always mix in water. Shake bottles before use, store at room temperature. Optimized for Gold Label single and mixed Hydro substrates.