GFO can be a little easier on your system because it does not eliminate phosphate as aggressively as Aluminium oxide does, but it is just as good, if not better at controlling it. Once again instructions should be followed, but not due to an aggressive nature, but because overdosing is wasting your money. Using any more media than advised will not hasten the process, but it can make it more aggressive. GFO performs better when gently ‘tumbled’ in a fluidized reactor, and is hard in nature, therefore will not release dust into the display. Although GFO is ideal in a reactor, it can also be placed in a media bag placed in a fast moving flow in the sump. The following media belong to the GFO group:
Rowaphos
TL Reefs GFO Phosphate Remover
The above media should be monitored at the reactor outlet. Should the reading at the outlet climb above 0.03ppm, it is time to replace the media. I have personally used Rowaphos and other GFO phosphate removers. All of which I have used in a Phosban 150 fluidized reactor connected to a 200gph pump. What I like about the reactor is that it is easy to maintain and clean, and is supplied with a control valve allowing you to control the flow into the reactor.
For more information on ROWAphos, read this article.
For more inormation on GFO’s, read this article.