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How much Ca(OCl)2 must be added to a flow of 1500 m3 /d to produce a total combined chlorine residual of 0.75 mg/L as Cl2

How much Ca(OCl)2 must be added to a flow of 1500 m3 /d to produce a total combined chlorine residual of 0.75 mg/L as Cl2 if the water contains 0.12 mg/L of S2- and 3.0 mg/L of NH4+ ? There are no other significant chlorine-demanding substances; assume reaction stoichiometries are strictly obeyed.

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