If you are using ...

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If you are using polyelectrolyte, you have to take into account that polyelectrolyte used has already loosed its coagulation properties. In order to clarify and filter the rejected water you have to proceed a new coagulation (chemical addition and polyelectrolyte) and filtration.

You have to estimate (after laboratory coagulation tests) the additional chemicals you will need to use, which should be maybe equal or more from what you are using now for the main treatment per day. I suppose it will not be an economical treatment conserning the water quantity you will recover.