Technaflora pH Up 1 LiterTechnaflora's pH Up and pH Down enable the gardener to moderate and maintain optimum pH levels. The pH scale is a measure that describes the relative acidity or alkalinity of a solution or medium. Both pH balancing aids are manufactured using the highest quality ingredients: potassium hydroxide to raise pH and nitric acid to lower pH. While ensuring stringent industry safety standards are met, Technaflora's pH Up and pH Down are potent and effective