Calcium Reactor, kalk reactor?? which one?

[mark]

again no experience on this but from reading, seems a good DIY doser for two part can be a couple of Drew's Dosers or even a Aqualifter pump and individual timers or since you have a PLC, control the AC receptacles as required.

The Drew's come in a few different ml/minute sizes.

Check this thread, some pictures and gives an idea how much to dose