Using kalk water only for topoff?

[Aquattro]

Stephane, perhaps it works with the reactor, but Mason doesn't have a reactor. He is mixing kalk and putting it in his sump, and I'm not sure he knows why he's doing it. Maybe 'cause it's the popular thing to do.
I dosed kalk for the first year of my tank and if I didn't test regularly, I ended up with problems. I had to always balance the levels with Kent A + B .