Clorox POOL & Spa XtraBlue Pool Algaecide, 40 oz Net Content, Liquid Form, Slight Odor/Scent, Blue/Green, Compositions: Copper Sulphate, Poly Oxy-1, 2-Ethanediyl(Dimethyliminio)-1, 2-Ethane, Diyl(Dimethyliminio)-1, 2-Ethanediyl Dichloride, Aluminum Sulfate, 13.4 mPa-s Viscosity, Pour-On Application Method, >100 deg C Flash Point, Flammability: 0, 10.29 lb/gal Density, 1.234 Specific Gravity, 3 to 4 pH