Simple and cheapest way is ...

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Simple and cheapest way is to expose the water to the Direct sunlight with thorough Aeration.

Sodium thiosulphate can be used @ 0.75 ppm for 1 ppm residual chlorine 

 

Ascorbic acid or Vitamin C can be used @ 1:1 ratio. 

 

Activated carbon too can be used 

it is more useful to reduce chlorine concentrations, Odorous, Chloramines (Carcinogens) and heavy metal & pesticides 

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