Dosing Kalk in ATO, Alk "stable" but shifts from 7-9 depending on top off timing/activation.

[Ferrell]

I was just going to suggest a new kit. I had the same issue with my Alk tester and the solution was either old or bad. A new bottle of solution did the trick.
In addition a separate dosing pump is a lot better that dosing from the ato… ask me how I know?