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I am trying to add $\pu{2 g}$ of $\ce{KHCO3}$ to $\pu{20 L}$ of RO water $(\mathrm{pH} = 5.2)$ which theoretically it will add

$$ \begin{array}{lr} \hline \ce{K+} &\pu{10.32 ppm} \\ \ce{HCO3-} &\pu{16.1 ppm} \\ \hline \end{array} $$

Will my TDS measure only the $\ce{K+}~(\pu{10-11 ppm})$ or it counts also $\ce{HCO3-}~(\pu{26-27 ppm})$ (or even $\ce{CO3^2-})?$

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  • $\begingroup$ In my understanding, TDS meter estimation is based on conductivity measurement, so it takes into account all ions. $\endgroup$ – Poutnik May 20 at 3:56

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