Just sharing my experience with AST's AC.
I've just started using AST Ultimate for a couple of water change and i must say that it does its job well . I was using prime prior to this and on and off one of my ray would develop some white spots. But after using AST ultimate and closely monitoring the ray, i've noticed that there is no white spots in the short period of time that i've used it.
Also the PH of my tank upon water change normally rises to approximately 7.02 after my WC and drop to 6.7-6.8 after a few hours. But using Ultimate it rises up to 7.14 and manage to hold for a little longer then before.
Above are just my limited personal experience with AST Ultimate.
Cheers
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