PO4x4 does it compare with GFO

[Bosco]

Has anyone used PO4x4 for phosphate removal? Does it work? How does it compare to GFO?

 

[Boomer]

It is nothing more than a GFO with a more or less protective coating on it, which gives it better abrasion factors and less leaching of the iron into the the water. It is also finer in size so there is more grains per unit vol. It works great and is better than std GFO IMHO.