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