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