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