Queries on water purification : Merits & de-merits of bleaching Powder vs hypochlorous acid

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What are the merits and demerits of Bleaching powder vs hypochlorous acid when used for drinking water disinfection? The scheme planned uses pumps and mild steel pipes for supplying water. Also please advise on dosage per KL of water.

Also is chlorine concentration in bleaching powder affected on storage over time? I have gone through the information available on the India Water Portal but I am still not satisfied. I am a Civil Engineer working with Public Health Department and the Department has been persisting to shift over from Bleaching powder to some other alternative for disinfection of drinking water. Therefore, I need this information as to which is a better option to bleaching powder and why?

  

Er.S.K.Vats
Chief Engineer
IPH Department
Mandi
satishkvats@hotmail.com