Thank you everyone!
I will go to my LFS and ask for some Kalk.
I'm confident that this won't be the last time I have to deal with these.
I found a variety of threads on this subject here on RC. One of the beauties of this forum is that there are so many points of view. Regrattably, one of the problems with this forum is that there are so many points of view.
Cheers!