A dispenser is disclosed which releases {HEAD ~ a substance} such as {TAIL ~ chlorine} into an aqueous solution such as the water of a swimming pool 
such as
A dispenser is disclosed which releases { HEAD ~ a substance } such as { TAIL ~ chlorine } into an aqueous solution such as the water of a swimming pool
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH