Hi Abdulai, you have given us ...

Hi Abdulai, you have given us very limited information, but something else to consider is if the polymer is adequately diluted at the point of dosing, followed by adequate rapid mix and flocculation before settling. Without knowledge of the polymer I would say that the polymer should be less sensitive to rapid mix and flocculation energy than aluminium sulphate, while dilution could potentially be a bigger problem. Hope you get it sorted.