Firstly, you should take ...

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Firstly, you should take sample of your water at the source then have it tested for possible pollutants ( eg. heavy metals,...), then from the result you will know whether a kind of treatment is needed before distributing it. however if water doesn't contain any pathogen or harmful substance and yet it has to pass through a pipeline from the source to the end users, you will need to either do the chlorination to help the desinfection along the distribution line just in case any pathogen get into that network is deactivate and leave the people safe  or you can use the TUV to achieve the same results.

Have a nice day.