Dear Abdulai, what is the ...

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Dear Abdulai,

what is the retention time for the flocculation process? With alum salts, the floc formation is much faster than with polymer. With alum it might take 2 - 5 min, with polymer 30 - 45 min. Besides, you need to apply different mixer types and different mixer velocities when changing from a salt based coagulant to an organic flocculant.  

Regards

Carlos