Der_Iron_Chef,
Here is how I set it up:
I started with my Phosban reactor, then I removed the sponges.
I added on tubing for the intake and output.
I used John Guest fittings because the tubing fit over the fittings.
Then I added in Kalk powder from LittleSilverMax, and hooked it up to my top off pump. I'm only using 2 teaspoons of powder in the reactor at the moment. After that I shook up the reactor, and manuvered all the bubbles out. I've adjusted the drip rate to be avoid spiking my pH, and arranged for it to drip in a high flow area, in this case, the output of my skimmer. Now I just have to remember to shake the reactor up every few days.
I hope this helps, or at least clarifyies the process. Let me know if you need more information.