In Step 23, {HEAD ~ the pumping} of the solution and the discharging of the liquid are controlled to {TAIL ~ optimum rates} 
controlled to
In Step 23 , { HEAD ~ the pumping } of the solution and the discharging of the liquid are controlled to { TAIL ~ optimum rates }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL