A channel is provided whereby {HEAD ~ the metallic ions} can flow into {TAIL ~ the body} of water 
flow into
A channel is provided whereby { HEAD ~ the metallic ions } can flow into { TAIL ~ the body } of water
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH