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