In larger installations a signal output from an oxygen analyzer 9 feeds into controller 5 to automatically adjust the ratio of reducing agent to adjust for any variation in {HEAD ~ oxygen content} of {TAIL ~ the water} being treated 
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In larger installations a signal output from an oxygen analyzer 9 feeds into controller 5 to automatically adjust the ratio of reducing agent to adjust for any variation in { HEAD ~ oxygen content } of { TAIL ~ the water } being treated
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 TAIL OTH OTH