Just give a little warning that food grade kalkwasser is not manufactured to reef keeping standards, some people have had issues while using pickling lime, such as unexplained algae outbreaks, fish kills. On the other had some people have used it for several years with no issues. I would recommend using a kalk blended for reef keeping. Contact Davy on the ORCA forum under DTI for a good cost effective source for reefkeeping kalk
Just my .02
George