{HEAD ~ The backflush pump} draws {TAIL ~ the backflush fluid} from the reservoir at a defined time 
draws
{ HEAD ~ The backflush pump } draws { TAIL ~ the backflush fluid } from the reservoir at a defined time
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH