Acidity as opposed to alkalinity are key factors for your crop’s water and root zone, as measured by pH. When you have too high or too low pH, your crops can’t uptake nutrients, and might be damaged or even killed. That is why smart growers day by day monitor and adjust optimum pH levels for hydroponics, sphagnum moss, coco coir, rockwool, aeroponics, soil, and other sorts of plant growth media. Some companies make cheap, inferior pH adjustment products that never achieve consistent results; a few of those products contain harmful materials. Advanced Nutrients pH products are carefully-manufactured pure concentrates which can be pharmaceutical grade.