I don't think that is zeolite. Ion exchange resin is one thing, zeolite is another.
This isn't my area of expertise but I think IER is a polymer that has extremely polar covalent bonding sites for ion to bond to which is what allows the ion exchange process to take place. Zeolite is sort of a "molecular filter" it has pores that are so fine that large molecules can be trapped by them. Kinda like an RO membrane but the pores aren’t as small.
I could be wrong about that though. Time to google.......