Nutrient pH is related to the plant growth and nutrient components, but it is not easy to control the nutrient pH. In this study, based on the characteristics of the quartz porphyry, which create a pH-buffer and ion exchange actions due to its negative charge. Water production having pH-buffer action was investigated by an effective water treatment system (HITEC-TYPE). As the result, The pH of the nutrient was not rapidly changed, and was maintained in a stable condition at about 7.0 even with the addition of alkaline, and the EC was not reduced.