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