Acidity versus alkalinity are key factors in your crop's water and root zone, as measured by pH. If you have too high or too low pH, your crops cannot uptake nutrients, and may well be damaged or even killed. Some companies make cheap, inferior pH adjustment products that never achieve consistent results; some of those products contain harmful materials. Advanced Nutrients pH products are carefully-manufactured pure concentrates that are pharmaceutical grade. Advanced PH Down is up to 4 times more concentrated than the competition
WARNING: DO NOT STORE pH UP AND pH DOWN SIDE BY SIDE!