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