Answer
Free chlorine 0.2–0.5 ppm after contact, pH 6.5–8.5 (pH matters because chlorination is less effective above 8), and no coliforms/E. coli.
Detailed question
What should drinking water on a ship read?
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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