As early, I and the other have sugested, you should test a new optimal dose of the coagulant and optimal pH ​value for coagulation or you should try to use another  coagulant, for example aluminum sulfate, or mixture of different coagulants) and for the best flocculation you will try to use some polymer. For these necesery you should carry on laboratory tests. Good luck and good results!

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As early, I and the other have sugested, you should test a new optimal dose of the coagulant and optimal pH ​value for coagulation or you should try to use another  coagulant, for example aluminum sulfate, or mixture of different coagulants) and for the best flocculation you will try to use some polymer. For these necesery you should carry on laboratory tests. Good luck and good results!