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