Answer
Re-pickle and re-passivate the area, then retest.
Detailed question
What does a positive result mean?
RXSOL CHEMO PHARMA International Navi Mumbai, India
Try "boiler water treatment", "tank cleaner" or a chemical name such as "citric acid".
7,061 products across 71 categories for marine, industrial, water treatment and laboratory use.
Browse all products Product catalogue
Re-pickle and re-passivate the area, then retest.
What does a positive result mean?