PROBLEM TO BE SOLVED: To provide a verdigris treatment agent and a verdigris treatment method that can effectively remove verdigris occurring on a copper-based member with one agent, and also that can effectively prevent occurrence of verdigris； and to provide a water treatment agent and a water treatment method that have higher immediate effectivity against Legionella, that exhibits an effect also against bacteria and fungi, exhibits a slime control effect and disinfection property against a wider range of microorganisms, has even an anticorrosive effect for copper, and in addition, does not promote corrosion of an iron-based member.SOLUTION: Provided are: a verdigris treatment agent and a water treatment agent, each containing dichloroglyoxime； and a verdigris treatment method and a water treatment method, in each of which dichloroglyoxime is added to an aqueous system with which a copper-based member is in contact.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】一剤で銅系部材に発生した緑青を効果的に除去し、また、緑青の発生を効果的に防止することができる緑青処理剤及び緑青処理方法を提供する。レジオネラに対しより即効性が高く、細菌、カビに対しても効果を示し、より広範囲な微生物に対しスライムコントロール効果と殺菌性を発揮すると共に、銅に対する防食効果をも有し、また、鉄系部材の腐食を促進することがない水処理剤及び水処理方法を提供する。【解決手段】ジクロログリオキシムを含む緑青処理剤及び水処理剤。銅系部材が接する水系にジクロログリオキシムを添加する緑青処理方法及び水処理方法。【選択図】図１
