It also accomplishes this result without the excessive expense of {TAIL ~ water treatment} which has previously made such proposed use of superposed turbines impractical for continuous duty at {HEAD ~ such high pressures} 
It also accomplishes this result without the excessive expense of { TAIL ~ water treatment } which has previously made such proposed use of superposed turbines impractical for continuous duty at { HEAD ~ such high pressures }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD