Calcium bicarbonate is then processed by {TAIL ~ a cation exchange system} to produce {HEAD ~ soda carb} such that: 
Calcium bicarbonate is then processed by { TAIL ~ a cation exchange system } to produce { HEAD ~ soda carb } such that :
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH