To add kalkwasser or not?

[swordfish]

I am going to be selecting a few things to add to my tamk soon as fr as supplements that it takes to keep a reef going. Amongst them I have been debating about whether or not to add kalkwasser. Can I hear some elaboration as to what it is exactly and why or why not we in the Order of Nanoreef use it?

 

Thanks,

 

Jeff