I need some chemists to chime in here as I'm looking in to Alfa Chemicals .com for a replacement go BRS GFO. They sell what looks to me as GFO as red iron oxide which I'm speculating is exactly what GFO really is. I have written to them with no response back for days so not sure why. Can some one figure out on their site what is GFO? We will save thousands if we can figure this out.