I think matrix is heat cracked zeolite. (might be a ceramic but I am pretty sure it's zeolite mineral, anyone know for sure?). It will remove the nitrites and nitrates which you don't want to remove. Planted tanks need that stuff and we add it in with fertilizers. In a planted tank you don't need to worry about ammonia either. The plants love that ammonia, nitrite and nitrate stuff. You want to keep it in your tank.
If you've got a fish only tank and an ammonia problem, go ahead and use it. It is great at what it does.