The storage tank may be {TAIL ~ an independent unit} relative to the apparatus for {HEAD ~ the ozonated water production} 
The storage tank may be { TAIL ~ an independent unit } relative to the apparatus for { HEAD ~ the ozonated water production }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD