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. That’s why smart growers daily monitor and adjust optimum pH levels for hydroponics sphagnum moss coco coir rockwool aeroponics soil and other types of plant growth media. 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. Why are the containers of Advanced Nutrients pH adjusters so much heavier than the competitions? It's true! Pick up a 4L of Advanced Nutrients pH Up in one hand and a 4L bottle of our competitors in the other and you will quickly be able to tell which one is the highest quality. Most nutrient companies that sell liquid pH adjustment products dilute the concentration in order to squeeze a little more money out of the grower. Advanced Nutrients is committed to supplying growers with absolutely superlative products and subsequently most of our products are far more concentrated that the competitions. Substantial saving for the end customer compared to competitors pH adjusters. WARNING: DO NOT STORE pH UP AND pH Down SIDE BY SIDE! the label at the first sign of pH trouble, and make sure to monitor the pH level to keep your plants in their pH “sweet spot”.