Dr Don, ag lime is the stuff you buy at home depot. Hydrated lime is what you want to use with alum. Ag lime is too slow to raise ph.

Alum won't mix with the water much at all except from wave action in 3' of water or less--no good for anything deeper.
Alum should be mixed into a slurry and either sprayed(best way) or mixed into a prop wash. It is best to turn off the aerator for 24 hours or so to let the flock fall to the bottom.

Last, a 2/3 acre pond will need from 150to 400lbs to do much good. Using less than what takes ALL the suspended clay out of the water column will allow it to resuspend.