High Alk

[Jack]

That isn't even a harmful alkalinity to be at so don't worry too much.

Natural sea water is 8dkh so you are pretty close.

The thing you may want to worry about is the slight upwards pH spike after adding that much kalk.. but even with your water volume you won't need to worry about that either.

I think you'll find lots of hobbiests keep it around 10 dkh +- 2dkh.

Hope that helps and calms your worries.