Aqua-lifter for Kalk-top up water?

[Delphinus]

If you got a kalk reactor, you could use the aqualifter to push RO/DI into it which would then come out of the reactor as mixed kalk.

Using the aqualifter on kalk itself though is very likely to gum it up with precipitates. The kalk reactor idea would be better, although that will depend on how good at DIY you are, or if you could find a kalk reactor for sale at a price you'd be OK spending..