Chris,
before I made the Kalk reactor, I used to use vinegar - adding it at 15ml to 1g of Kalkwasser. I never took the time to titrate the solution in order to find the quantitative benefit of vinegar, but, it certainly never harmed anything I know of.
Since the vindegar chemically does improve the catalitic conversion, I would imagine it has to be beneficial to some degree.
However, since I made the kalk reactor it is 1-not possible to add it, and 2-not necessary. The kalk reactor, as an added benefit to not having to mix anything repeatedly, also makes the most of the kalk, i.e.: the least waste. It converts what it needs to make the 12+ pH, leaves the rest untouched, to be used when more RO/DI flow through the reactor.
Does this help?