Just call me old fashioned I guess, I use both a kalk reactor and a Calcium Reactor. Plus a beckett skimmer but thats another story.
Here is my DIY Kalk Reactor. Its the same principle as a Precision Marine or GEO reactor. Freshwater from my ATO system pumps through it to mix with the kalk powder inside which is then pushed into the aquarium. The pump on the side turns on with a timer several times each day to give it a quick mix. Once every two weeks I open up the top and dump another cup of kalk into the reactor.
Here are some articles for further reading:
What Your Grandmother Never Told You About Lime
http://reefkeeping.com/issues/2005-01/rhf/index.htm
The Self Purification of Limewater (Kalkwasser)
http://www.advancedaquarist.com/issues/may2003/chem.htm
The Degradation of Limewater (Kalkwasser) in Air
http://reefkeeping.com/issues/2003-0...ture/index.htm
Magnesium and Strontium in Limewater
http://www.advancedaquarist.com/issues/dec2003/chem.htm
How to Select a Calcium and Alkalinity Supplementation Scheme
http://www.advancedaquarist.com/issues/feb2003/chem.htm