1. 
   Polyelectrolytes
   Synthetic chemicals that help solids to clump during sewage treatment.
   Found op http://www.epa.gov/OCEPAterms/
   
   
2. 
   Polyelectrolytes
   natural or synthetic water-soluble macromolecules that assist in the flocculation of dispersed solids
   Found op http://www.oasisenviro.co.uk/Glossary%20N%20to%20R.htm
   
   

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