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