depuration
noun
                                                                                                                            
                                                            dep·u·ra·tion
                    
                                                                                                              
                                                                                                                                  ˌdep-yə-ˈrā-shən 
                                                      
                                                          
            
                                
              
          
                                                      : purification of impurities or heterogeneous matter                                      
              
                             
depuration of shellfish from polluted waters
                         
                
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  Merriam-Webster unabridged




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