The power source connected to the cells produces {HEAD ~ a chemical reaction} that produces {TAIL ~ a flow} of chlorine atoms into the body of water for purifying the body of water 
produces
The power source connected to the cells produces { HEAD ~ a chemical reaction } that produces { TAIL ~ a flow } of chlorine atoms into the body of water for purifying the body of water
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH