Dripping kalk is great.... if you don't mind the tediousness. Personally, I switched to a DIY 2 part because my alkalinity/ PH wouldn't maintain w/ kalk alone. I would have great calcium levels and low alk and ph. I would start with kalk dripping and test your levels over the span of a few months. Don't forget magnesium plays a crucial role in the calcium, alk, ph battle. A few articles to get you started:

http://www.advancedaquarist.com/2003/10/chemistry
http://web.archive.org/web/20021127040526/http://www.advancedaquarist.com/issues/nov2002/chem.htm
http://www.advancedaquarist.com/2002/6/chemistry
http://www.advancedaquarist.com/2003/2/chemistry
http://www.advancedaquarist.com/2002/2/chemistry
http://www.advancedaquarist.com/2002/11/chemistry
http://www.advancedaquarist.com/2004/4/chemistry