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