HydroCoco A/B for Coco substrates Gold Label Coco A/B is a professional grade mineral two component base plant nutrient for the vegetative and flowering phase in Coco substrates. Add A & B in equal quantities, 0.5 - 2.0 ml/L, 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.