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