{HEAD ~ Coagulant addition} in {TAIL ~ the underwash feed water} reduces the solids content reporting to the primary bitumen froth in a primary separation vessel  
in
{ HEAD ~ Coagulant addition } in { TAIL ~ the underwash feed water } reduces the solids content reporting to the primary bitumen froth in a primary separation vessel
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH