Answer
Theoretically 7.9 ppm, in practice about 10 ppm of commercial sulphite per 1 ppm dissolved oxygen, plus the reserve.
Detailed question
How much sulphite per ppm of oxygen?
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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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