I haven't actually tried it yet, just been researching the past few months about it. I'm going to simply set up a kalkwasser drip bottle, althought I am going to mix it with a small portion of vinegar first (have to find the article that I have tucked away somewhere that explains how that helps to release and free the carbon so that it doesn't start to precipitate the calcium on the bottom of the tank).
There's a current discussion in the Reef section about dosing magnesium, and I'm thinking this might alleviate that issue as well:
http://www.canreef.com/vbulletin/showthread.php?t=72291
Unfortunately, by posting that I have created an infinite internet loop. I hear there is a special place in hell for people like that.
