I saw a video that Mr. Saltwater posted on the stuff. I originally started my dose with 2 tbsp/ gallon of water for a typical 5 gallon jug. I upgraded my system to use a 13 gallon container and now I add about a full cup of Kalk powder. Like most people who have commented, I wait for the stuff to settle before I turn my ATO back on. I have an apex controller so I use that to keep my parameters pretty stable. For the most part, I have several variables that if they occur they turn off the ATO within my Apex programming.
I have so far been able to keep my PH at a stable 8.19. Great stuff and I highly recommend it for most people before doing 2 part dosing. Being at the max of the amount you should dose, no more than 5 tbsp/ gallon, if my system continues to need Ca, and Alk, I will need to dose with 2 part. So far I have no need for it.