... LEMON ACID,POLLUTEDWATER TREATMENT,LEATHER,WASTE GAS TREATMENT,WATER PURIFIER,GOLDMINING,PAINTING,BLEACHINGAGENT,EPOXY PROPANE,PETRO-CHEMICALPRODUCTS. ... ETC. Specification GradeCaO(%)Impurity( % )CO 2 (%)Remains above the mesh600um150umspecial≥ 72.0≤ 3.0 ... 7 ppm,HUMIDITY ; 0.36%PURPOSE: River water PH adjustment. factory sale 93%--98% calcium hydroxide for drinking water