I have been using Zeolite in my mix for years.
I feel that it increases the CEC of the mix being it has a negative charge to it.
Its greatest affinity is for NH4+ Ammonium nitrogen, Potassium, Magnesium, Calcium and Iron any of the cations will adhere to its surface and be easily released by plant driven exudes.
I use it @1-2 TBLSP/gal.
I find the kind that I have is neutral to slightly acidic around 6.8-7.
I also believe that pH must dive really deep for any Aluminum to be released for its a tight bond that they have with each other.
It is also a fact that much aluminum makes up our dirt.
I believe it is the 3rd most found element in our soils.
By the nature of the bonds that form Zeolite there is much surface area for beasties to set up homes
If a peep were to charge his Zeolite with whatever cation he would so wish, then not only homes but condominiums with room service.
It also bring some drainage and aeration to the mix.
Some say a Calcium Bentonite Clay is better in raising the CEC but I feel it does not provide all the surface area that the atomic structure of Zeolites bring.
On ammonium nitrate gasses escaping I believe that a little soft rock phosphate mix inn stops this off gassing.
For the life of me the reason why escapes me at the moment.