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M: +2.00/-0.66

How much bleaching powder (having 20% available chlorine) is needed to disinfect 10,000 litres of water whose chlorine demand is 1.0 mg/l? It should be ensured that, after about 1 hour contact time, 0.2 mg/l chlorine is available.

[ESE (IES) CE 2017 Technical]
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