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