Unless you have Rift cichlids etc, I'd not worry about the water changes done via ADA AS.
I've spend a long time using a number of products over the years.
I even warned Jeff from ADG that the test I did on ADA As might not be what he thought, but I proved myself wrong.
And that is a good thing because the end result is that is satitified my critiques and did and super job, looks very nice also, something I've bugged over with the SeaChem Flouirite and Onyx sand. EC is junk with all those different grain sizes but it has a better color at least than flourite. But ADA is cheaper than EC.........
Most folks that have tried ADA AS will not go back as you can see, there's a reason why I, Jeff, Luis, David, Amano etc use it.........