Cutting Edge Solutions pH UpCES pH Up Concentrated pH adjustment liquid, alkaline buffer raises water and nutrient solution pH. Highly concentrated, use conservatively. Slowly add to pure water or nutrient solution, at small intervals. Note beginning reading and then test pH. Repeat small application process and stir well, until desired pH is achieved. Amount of CES pH Up required for adjustment will vary, depending on the strength of nutrient mixture and purity of the water