The ability of the user of the scrubber to change scrubber sections to fit the requirements of the material being treated greatly adds to {HEAD ~ the efficiency} of {TAIL ~ the overall device} 
of
The ability of the user of the scrubber to change scrubber sections to fit the requirements of the material being treated greatly adds to { HEAD ~ the efficiency } of { TAIL ~ the overall device }
OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL