Presence of {HEAD ~ brine water} with {TAIL ~ a salinity} of 8 to 12% is crucial because it is used to regenerate the cation exchanger such that: 
with
Presence of { HEAD ~ brine water } with { TAIL ~ a salinity } of 8 to 12 % is crucial because it is used to regenerate the cation exchanger such that :
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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