While they recognise that electrode corrosion play a role here, experience has shown that {HEAD ~ electrode corrosion} is {TAIL ~ the major problem}, not electrolysis 
is
While they recognise that electrode corrosion play a role here , experience has shown that { HEAD ~ electrode corrosion } is { TAIL ~ the major problem } , not electrolysis
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 OTH OTH OTH