Yea I thought about mixing my own, but, since this is my first time useing them I want to use pre-mixed so I can see the negative and positive before I try something on my own. This way I'll have a comparison. But I am willing to buy the Seachem flake or powder to try first off.
Kalkwasser...hmmm...I'll have to check it out. I thought you needed a reactor for that?