The chlorine or {HEAD ~ other soluble material} within the bag or sachet is dissolved or subjected to {TAIL ~ a leaching action} in the liquid 
is dissolved to
The chlorine or { HEAD ~ other soluble material } within the bag or sachet is dissolved or subjected to { TAIL ~ a leaching action } in the liquid
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH