PROBLEM TO BE SOLVED: To provide a stable water treatment agent composition including a bromine based oxidizer and a sulfamic acid compound and having a freezing point lower than a theoretical freezing temperature.SOLUTION: The water treatment agent composition comprises: water a bromine based oxidizer of 1-16.5 mass% to the total amount of the water treatment agent composition as an effective bromine concentration sulfamic acid equivalent to 0.7-2.0 times to the molar amount of the bromine based oxidizer and alkali including at least one of sodium hydroxide and potassium hydroxide and has a pH of 12.5 or more and a water concentration of 54 mass% or more to the total amount of the water treatment agent composition.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】臭素系酸化剤とスルファミン酸化合物とを含み、理論凍結温度よりも低い凍結点を有し、安定な水処理剤組成物を提供する。【解決手段】水と、水処理剤組成物全体の量に対する有効臭素濃度として1~16.5質量%の臭素系酸化剤と、臭素系酸化剤のモル量に対して0.7~2.0倍当量のスルファミン酸と、水酸化ナトリウムおよび水酸化カリウムのうちの少なくとも1つを含むアルカリと、を含有し、pHが12.5以上であり、かつ水処理剤組成物全体の量に対する水分の濃度が54質量%以上である、水処理剤組成物である。【選択図】なし
