How to get rid of acid smell in water from open well, which persists even after cleaning with bleaching powder ?

In my residence at Karaikudi, Tamilnadu we have used well water for 15 Years for all purposes including drinking. For the past 20 days it has an acid like smell, even after using bleaching powder it remains the same.

For drinking purposes it's purified by RO System so no smell, but for bathing is it advisible to use it? How to get rid of the acid smell?

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