Advanced Nutrients' Sensi Grow A+B Pro 1 kg basic nutrient is specifically designed for hydroponic systems such as aeroponic, drip, NFT, Ebb & Flow or Deep Water Culture systems. Unlike traditional fertilizers, the Sensi Professional Series provides precise micronutrient ratios for each phase of plant growth. During growth, plants absorb more calcium, iron, manganese and boron and less nitrogen, potassium, zinc and phosphorus. During the flowering and production phase, nutrient requirements change. The Sensi Professional Series provides a constant flow of readily available nutrients thanks to chelated iron and urea. The pack contains 1 kg of component A and 1 kg of component B.