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