pH Down Solution uses food grade phosphoric acid to lower the pH to the proper level. Grower’s Tip: Most tap water is in the 7.0 to 8.0 range. Hydroponic nutrients are typically acidic and, when mixed in tap water, usually drop the solution into the proper range. Note: pH Up
pH Up Solution is a base solution which is formulated using potassium hydroxide and potassium carbonate. Add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level.