Answer
The ferroxyl test (potassium ferricyanide) is more sensitive for free iron; RXSOL supplies that kit too.
Detailed question
Is there an alternative test?
Products
RXSOL CHEMO PHARMA International Navi Mumbai, India
Try "boiler water treatment", "tank cleaner" or a chemical name such as "citric acid".
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The ferroxyl test (potassium ferricyanide) is more sensitive for free iron; RXSOL supplies that kit too.
Is there an alternative test?