At the point that {HEAD ~ 90 100%} of {TAIL ~ the newly injected oxidant} has been consumed, a second port is used to introduce more oxidant and water in a similar manner and under similar conditions 
of
At the point that { HEAD ~ 90 100 % } of { TAIL ~ the newly injected oxidant } has been consumed , a second port is used to introduce more oxidant and water in a similar manner and under similar conditions
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH