PH Up (potassium hydroxide)

Contains potassium hydroxide (Potassium Hydroxide) at a concentration of about 25%, which will quickly and efficiently raise the acidity in your nutrient solution to the optimal level, making the nutrients more available and increasing their absorption by the plant.

Advice for gardeners: 

The acidity level in tap water is between 7.0 to 8.0 PH.

Hydroponic nutrients are usually acidic; after mixing them with tap water, they will usually lower the acidity level of the nutrient solution to the appropriate range for the plants (5.5-6.5). Therefore, the acidity level in the water should be checked only after adding the fertilizers.