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Standards History
AWWA B402   2018   Ferrous Sulfate 80 $
AWWA B402   2012   Ferrous Sulfate 80 $
AWWA B402   2006   Ferrous Sulfate 50 $
AWWA B402   2000   Ferrous Sulfate 30 $
AWWA B402   1995   Ferrous Sulfate 30 $