<prompt> Percentage available chlorine from bleaching powder is:-10336695  <response>: Bleaching powder contains : 33 available chlorine. Bleaching powder required for disinfection of 1000 litres of water 2.5 grams. Also Remember, Free residual chlorine levels recommended in:- Drinking water 0.5 mg L ; with contact period of 1hr. Drinking water to kill cyclops 2.0 mgL ; with contact period of 1hr. Swimming pools of India 1.0 mgL ; with contact period of 1hr. 