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1. Is UV tube & TDS adjusting valve necessary?What is optimum TDS?

We live in a 10 storey building and we get drinking water from the overhead tank. The builder has provided a RO system (the specifications of which are not known). Recently we got the filter candle changed. At this time the service man checked the TDS which is only 7. We got the water which did not pass through the RO System and it was 350.

The service man has advised us to attach a UV tube and TDS adjusting valve. Is it necessary? What should be the optimum level of TDS? What should we do?

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