There are a few articles that describe calcium reactor set up (I think one is by "jdeick" or something like that) if you go to RC, then the chemistry forum, you can find links. There's lots of information in those; I'd really suggest reading them a few times.

As far as controlling the kalkreactor, I assume you mean how do you get water through it? The best way is with a peristaltic dosing pump like the litermeter or innovative aquatics nautilus. Those are both great; there are lots of other I don't know anything about but lots of others might.

If you're running both a calcium reactor and a kalkreactor, I would not use the ph controller, except maybe as an emergency shut off. The solenoid is supposed to stop CO2 flow in the event of a power outage, which is good, but just yesterday I was watching CO2 flow out of one of these exact regulators with the solenoid unplugged, so make sure yours is working. Don't try to regulate the reactor ph or tank ph by shutting CO2 flow on and off though; my experience is that it's far better to set your reactor ph correctly and leave it there. As long as your reactor is correctly dialed in and you're using the KW reactor to replace all your evaporated water, believe me your tank ph will be perfect.