SensiBloom A&B is a high quality 2 part nutrient solution. SensiBloom A&B is formulated with R.O. water, chelated nutrients, plus fulvic and humic acids, These acids assist in root development, pH stability, and yield enhancement. SensiBloom A&B is to be used in equal parts. Dosage is 2 – 4 ml. per liter. Price reflects cost of 2 bottles.