ATO Plus Kalk ??

[ShooterRick]

I ordered the rest of what I need for my ATO system. I have decided to add kalk to the ATO and have some questions:

1. If I raise the ATO pump off the bottom of the RO supply tank 2 inches, can I place Kalk in the supply tank itself and mix there?

2. Should I mix the Kalk first and then pour into the ATO tank?

3. My PH is usually pretty stable , 7.98 morning , 8.09 evenings. Can I mix Kalk and come up with a ratio to 15 gal. of top off water to just maintain PH at 8.2 average?

4. Should I place a second small pump in the ATO sump on a timer to stir from time to time?