<a href=showthread.php?s=&postid=12411892#post12411892 target=_blank>Originally posted</a> by pbradley0
From what I understand, as long as you have a system set up so water cannot bypass the GFO it should work just as well as a reactor. I think the Marineland with a media bag full of PhosBan would act as a makeshift reactor. I've seen some DIY reactors that worked in this manner.