Textile WasteWater treatment and recycle issues

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My question regarding wastewater sludge dewatering polymer issues in recycling section. We have UF followed by RO. Cationic Polymer is effecting UF. Choking its membrane and i read a articles about it some polymer escape from UF and effects RO.

Q1. What are the alternate for Cationic polymer we can use. 

Q2. RO permeability is reduced with in a week and required CIP every month. Is it true polymer can escape from UF