[QUOTE=Ray;920435
RO water tastes nasty, so those cartridges pass it over calcite.[/QUOTE]
I think that depends on what you're starting with... I have a little RO unit under the sink, I end up with a TDS of 15-20 PPM, nothing but the usual sediment and carbon filters, and the water tastes great... what comes out of the tap untreated tastes like chalk. So the "feedstock" is loaded with calcium carbonate, and Kvet has a similar composition - that's southern California. If the RO system takes the TDS closer to zero, maybe it's tasteless and flat. But starting with liquid rocks, I'd doubt that any more calcium needs to be added.
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