PURE WATER MANUFACTURING METHOD AND PURE WATER MANUFACTURING SYSTEM

PROBLEM TO BE SOLVED: To provide a pure water manufacturing method and a pure water manufacturing system each capable of preventing inadvertent contaminations by volatile organic matter without virtually changing an existing apparatus constitution.SOLUTION: The provided pure water manufacturing method is for treating pretreated water obtained by treating raw water within a pretreatment system within a primary pure water system equipped with a decarbonator and then treating the pretreated water within a secondary pure water system. On an occasion for performing a decarbonating treatment within the decarbonator by feeding therein treatment target water and by feeding therein blown air via a blow tube so as to induce the contact thereof with the treatment target water, the feeding quantity of the blown air is adjusted depending on the quantity of volatile organic matter within the blown air.