Then {HEAD ~ the coating solution} is sprayed on the surfaces and the reactor is drained of {TAIL ~ the excess solution} in such a way that the solution can be sent to a recovery system, if desired 
Then { HEAD ~ the coating solution } is sprayed on the surfaces and the reactor is drained of { TAIL ~ the excess solution } in such a way that the solution can be sent to a recovery system , if desired
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH