Answer
To reach 1 ppm available chlorine you need about 1 lb in 80,000 gallons; shock-dose tanks to 50 ppm for 1 hour, then flush and refill.
Detailed question
Chlorine powder for a water tank — how much?
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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