Spectrum Formulas pH Down Gallon is an essential part of every grow. What is pH? pH is a measure of acidity or alkalinity. A pH of 7.0 is considered neutral. A lower pH is considered acidic then a higher pH which is considered alkaline. Spectrum Formulas pH Down upholds optimal concentrated pH levels for soil grown and hydroponically grown plants. If the pH levels are too elevated or too low, your crops will be damaged or even killed since the crops did not consume the proper nutrients anticipated. Spectrum Formulas pH Down is the most concentrated pH available on the market today. It is imperative to preserve the correct pH levels in your hydroponic garden. Spectrum Formulas concentrated pH Down Gallon is an economical, cost-effective and convenient way to adjust hydroponic nutrient pH. By using Phosphoric Acid, our pH Down solution can be added by small increments to your reservoir for great results! Spectrum Formulas pH Down Gallon Directions for Use: When adjusting, to achieve the desired pH level for your solution, for hydroponically grown, soil plants and sphagnum moss, add small amounts of pH Up to your nutrient solution a little at a time, then test the pH level of the solution. Repeat this process and re-test your solution until desired pH level is achieved. For superior results, check pH levels daily. Recommended pH for most plants is 5.5 to 6.5. This product raises pH level. Spectrum Formulas pH aqueous solutions are specially manufactured from pure concentrates that are food grade. INGREDIENTS: Phosphoric Acid. Our Tip for Grower’s: The best or ultimate pH level for most enclosed harvests/crops is usually between 5.5 and 6.5. You should measure the pH of your water and allow roughly 1 hour to check the pH levels. If needed, modify and adjust the nutrients accordingly and repeat this method until pH is stabilized. Increase pH up or down in small amounts (1 ml per gallon) at a time.