I have changed the way I'm dosing kalk to the system. I have been looking at the "Chris Meckley" way of doing things for a while. I have always ran kalk on my tanks for the most part. Usually thru the ATO which I don't recommend due the possible failures that can occur.
I have had a kalk stirrer on this system in the early stages. I have since swapped it out for my old PM kalk reactor. I am having much better luck with my Ph now and dosing only at night.
Although I am having a cyano outbreak on my sand bed. I stopped vodka dosing until I'm able to get it under control.