I can assure you that there is absolutely no way I'll ever use it again on large tank as the substrate, neither I nor a client would be willing to.

ADA AS II would not have solved the issues from what I've seen either.

I love ADA As for smaller tanks................I still suggest it, but the trade offs in this larger tanks and the frequent water changes simply made using other methods easier at that scale.
The client really does not care about many of the plant species that are easier tio grow with ADA AS.

Regards,
Tom Barr