Answer
About 15 g of 70% calcium hypochlorite per 10,000 litres raises free chlorine by 1 ppm; dose to 1–3 ppm daily and 10 ppm for shock, keeping pH 7.2–7.6.
Detailed question
How much for a swimming pool?
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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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