High alk in nsw. Looking to lower before use.

[Proteus]

Opened new box of salt and like the last couple of boxes alk has been really high. 11.2 dkh (reefers best)
I've mixed and rolled and stirred to salt hoping it was just settled out but still high.
In my small tank this has a bigger impact on values then I can deal with .


I've read that muriatic acid will lower alk but looking for suggestions