That’s calcium hypochlorite, hydrated mixture
what type it is:
chemical name: calcium hypochlorite, hydrated mixture
中文: 次氯酸钙, 水合混合物
un no: un 2880
hazard class: 5.1 oxidizer
form: granular powder / hydrated mixture
pack: white plastic bucket with white lid. looks like 25kg bucket
what it's used for:
this is the "safer" version of regular calcium hypochlorite.