I found this article referenced in some other sites. The author claims that mixing kalk with water in a top off container produces too much precipitated calcium in the container because there isn't enough dissolved CO2 in the small container to fully disolve the Kalk. His solution is to dissolve 1 teaspoon of kalk in 15ml of distilled vinegar first and then dilute the mix in 1 qt of RO water. He swears by this and claims that no harm comes of it. Has anyone tried this method?

http://www.reefscapes.net/articles/b...alkwasser.html