The spent water can be concentrated to a caffeine content of from about 7 to {HEAD ~ about 30%} by {TAIL ~ weight} 
by
The spent water can be concentrated to a caffeine content of from about 7 to { HEAD ~ about 30 % } by { TAIL ~ weight }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL