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|1. (WO2018138957) METHOD FOR CONTROLLING PH BY ELECTRICAL CONDUCTIVITY|
|Applicants:||KURITA WATER INDUSTRIES LTD.
|Title:||METHOD FOR CONTROLLING PH BY ELECTRICAL CONDUCTIVITY|
Provided is a method for controlling pH to a neutral region (pH 6-8) by adding an alkali or acid to decarbonated water, wherein the addition amount of the alkali or acid is controlled by using an electrical conductivity meter. The decarbonated water is obtained by decarbonating industrial water or underground water to have a carbonate concentration of 10 ppm or less. The method may further comprise a step for RO-treating the decarbonated water, which has been adjusted to pH 6-8 by the pH control, to produce pure water.