... Free samples 4.flocculant coagulant Spray light yellow PAC, Polyaluminium Chloride, abbreviated PAC[molecular formula][AL2 (OH) LnCL6-n]mStandard ... water purification, wastewater and sludge treatment, industrial and chemical waste water treatment;Cement setting refining, casting molding, ... 4, for certain difficult industrial sewage treatment, with PAC as the mother, mixed with other chemicals to mix ...