Hi Mohammed.  Please do not ...

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Hi Mohammed.  Please do not neglect the need for maintaining a residual in the water after disinfection.  Many of the quoted alternatives do not provide a residual to keep the water clear in the distribution system.  Chlorine or chloramines are traditionally used for this.  Other chemical methods that also provide a residual are chlorine dioxide (more costly) and bromine (also more costly and some concern over the formation of bromates).  

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Hi Ian, Can you please explain this comment?  For example, if water is properly stored once properly treated what re-contamination could there possibly be?

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Because in the real world there is pipework that wasn't installed today and that has a biofilm and storage reservoirs  have to be vented thereby allowing air to come in and out of the tank and this can carry contaminants even if there is insect screening.

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