Maintaining the correct pH value is essential for the crops ability to absorb nutrients. If the pH value is too high or too low, the crop will not absorb the nutrients properly. PH+ 33% has been specially developed to correct the acidity (pH) in the nutrient solution upwards using the component potassium hydroxide. PH+ 33% is used to increase the pH value of the nutrient solution during the growth and flowering phase of the crop. Active substance Potassium hydroxide 33%.