Woops dkh & Kent Superbuffer

[Aquattro]

George, the first thing you'll want to do is determine your consumption levels. Measure your alk and retest 24 hours later. This tells you your daily alk consumption. It also tells you Ca since Ca and alk tend to move in a ratio. 1mEq/l change in alk will effect a 20ppm change in Ca. If you have a couple of euphylia (hammer, frogspawn) and softies (they use Ca too, btw), you most likely will not need to use kalk. If you do use it, don't mix it full strength. This will just end up as deposits of white spots all over your glass.
Your best bet would be to buy large bottles of your favorite 2 part solution and dose that. Once you determine your consumption, it's simple math to determine what dosage to use. Once you have some numbers, it might turn out that kalk might be an option. But until you know how much alk you need, you can't decide how to add it (economically speaking).