AlgaeBarn REFUGEOXIDE is an ultra-premium spherical granular ferric oxide (GFO).
According to our testing, this is the cleanest and least dust-generating GFO on the market. Due to its spherical nature, it results in less grinding while tumbling and the least amount of phosphate crystallization.
Phosphate crystallization is the reason that many other brands of GFO clump together.
By forming our GFO into spheres, we reduce the amount of channeling that happens, meaning you get the most utilization of your media.