I did run an ICP test last year. Aluminum values reduced from 180ug/L to 26ug/L. Upper spec limit for NSW is 10ug/L.
The removal of aluminum contributors + use of Continuum Aquatics Heavy Metal resin helped. Its still over spec limit but i'm not too worried about it.
Regarding Continuum Aquatics Heavy Metal resin. While it removes heavy metals, I believe it creates other issues as well by absorbing other 'good' elements. Hence use with caution.
The corals bounced back only after I started dosing more trace elements (I used Nyos range of additives)