{TAIL ~ No precipitation} occurs in {HEAD ~ the water} because its pH does not rise to the pH at which the pollutants of interest precipitate 
{ TAIL ~ No precipitation } occurs in { HEAD ~ the water } because its pH does not rise to the pH at which the pollutants of interest precipitate
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH