can somebody please tell me what to mix kalk per gallon... I can't remember

I mix a scant teaspoon per liter so that would be about 4 teaspoons or a heaping tablespoon per gallon. I dissolve mine in vinegar first.

I do a tablespoon per gallon too. i use vinegar when i think about it, which isn't often :(

If you accidentally use a little more, it will simply settle to the bottom of the container. Once the solution is super saturated, what can not bond, will stay solid, at the bottom. Be sure not to use this slurry unless you do so carefully. Yes, you can use it, but it's not a good idea, unless you are a Calfo or someone who pushes extremes :)

I don't use vinegar. I've had no problems mixing and keeping calcium levels with just RO/DI and kalk.

Dave

Also if you haven't already check out http://www.talkingreef.com/forums/podcast-episodes/157-kalk-podcast-episode-13-a.html and http://www.talkingreef.com/forums/podcast-episodes/674-diy-kalk-doser-video-podcast-episode-44-a.html.