Hi all,
Even if the TDS comprise entirely Ca++ and 2HCO3- ions it is still a small difference to the dKH (it will be <"4 and a bit" rather than "4")">.
It doesn't matter if the feed water to the RO unit had been through ion exchange (a unit that uses NaCl). It will still have <"the same carbonate content"> as the original supply.
cheers Darrel
It depends a little bit which ions make up the twenty mg/L TDS (~60 microS), but it should be OK. It is still a <"small amount of ions">.@dw1305 Would using RO water with a TDS at ~20 be ok for making the solution or it would need to be flat 0?
Do you know how hard the water in the RO feed was? If it was slightly salty, but soft, (for this use) it is effectively 0 ppm TDS, we are only interested in bicarbonate (HCO3) ionsIf you can get pure KCl it is 0.746g KCl in one litre to give a 1411 microS solution.
Even if the TDS comprise entirely Ca++ and 2HCO3- ions it is still a small difference to the dKH (it will be <"4 and a bit" rather than "4")">.
It doesn't matter if the feed water to the RO unit had been through ion exchange (a unit that uses NaCl). It will still have <"the same carbonate content"> as the original supply.
cheers Darrel
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