The concept is that the ferric oxide binds Phosphate when it is in a Dissolved Organic state or what we call Inorganic Orthophosphate. So yes it will bind any dissolved orthophosphate that passes through or by the media.
>A couple of things to watch for is that it can do it quite quickly which can have a negative effect on your reef tank as alot of things require DOP beside algae, so if using it go with a small build up of it and not an all at once type of approach.
>It also has an affection for carbonates so keep an eye on your calcium and alkalinity while using the product, and of coarse your PH (another reason to go slow)
>Since DOP binds to the surface of the GFO particulates the manufactures suggest not rinsing the product (as in smaller pieces add the the binding surface) but I always tell folks to give the product a good rinse as the particulates are small enough to be taken in by the various small mouthed critters we keep (corals) and the risk to the critter if that happens can be severe. Also I dont like the look of rust colored water?? lol
hope it helps
Mike