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