Check about the Cuprisorb, I think it mentioned binding some other heavy metals too. It isn't too expensive.
If you know the kind of fert tab /cap you can check on its contents and see if any of the ingredients would be harmful if too much, and if it is on the list Cuprisorb works on.
If you know the kind of fert tab /cap you can check on its contents and see if any of the ingredients would be harmful if too much, and if it is on the list Cuprisorb works on.