General Hydroponics CocoTek Premium Coco Nutrient two-part Bloom A (2-0-1) and B (1-5-5) liquid formula is a powerful, high-quality base nutrient specifically formulated to work with and enhance the unique properties of coconut coir. This aggressive formula contains proprietary blends of calcium and balanced levels of magnesium to ensure that plants thrive. Backed by years of research, CocoTek Premium Coco Nutrients are specifically designed to produce optimum results when used with CocoTek Premium Coco Coir. This nutrient system works well in hydroponics, soilless and soil applications. (Bloom B sold separately.)