Careful!!!!!I put Kalkwasser in my ATO resevoir tank to keep my pH balanced. It works like a charm.
I did this with my low uptake tank full of LPS and mainly zoas/palys..... your Alk will spike to 16 before you know it.
If you put Kalk in your topoff, you better be testing Alk 2x a week.
Better have a handle of what your tank is uptaking weekly
Just sayin'

