WHAT ARE YOU TESTING FOR? “We’re with the Senior Environment Corps. We come out here every month to test the water. I'm testing for dissolved oxygen. It’s a three stage process. We add manganese sulfate and the dissolved oxygen in the water oxidizes- don't try to write it down; chemists can't even explain it so well. Watch the colors change.” Ed Chun, Cresheim Creek at Germantown Avenue.
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