This invention deals with the field of {HEAD ~ purification}, particularly biologically, of {TAIL ~ waters} of any type, such as industrial waters, waste waters or water supplies to be made potable 
of
This invention deals with the field of { HEAD ~ purification } , particularly biologically , of { TAIL ~ waters } of any type , such as industrial waters , waste waters or water supplies to be made potable
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH