Textile WasteWater treatment and recycle issues

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