Hi Inamul, Remineralization ...

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Hi Inamul, Remineralization with CaCl2 + MgCl2 and KHCO3 is considered best for drinking. Remineralization will also adjust the pH. Caustic soda is not recommended. Other method is to blend raw water with proper treatment ( as necessary based on impurities present) but let me caution you that this is not the best method.