First prepare pac poly aluminium chloride & pam polyacrylamide water aqueous solution

Adjust the PH value of sewage water to neutral

First add pac poly aluminium chloride, fully stirred until floc formed, record the dosage of pac poly aluminium chloride

Then add pam polyacrylamide, fully stirred, when you find the floccule is lage and close and can rapid subsidence, record the dosage of pam polyacrylamide

Get the best proportion of pac poly aluminium chloride & pam polyacrylamide by test