Quote Originally Posted by BCTate View Post
For me, it took a good 4 weeks for the GFO to get my phosphates down to undetectable! IMO, 4 days is just the start! Initially, you may need to replace the GFO every week, as it can deplete it's phosphate binding ability quickly if the phosphates in your system are really high. Once you get your phosphates to the desired level, the GFO can then last up to a month before needing replaced. HTH!
About a month later now, have reactor running 24/7 and the sock in the belly... Still at 10ppm... I've added some macro algae, no difference, changed from PhosGuard pellets after 2 weeks to PhosBan (GFO) b/c the LFS said they've been getting lots of reports that the PhosGuard wasn't working... Slowly creeping down now after 2 weeks it seems, as the tests don't seem to be AS dark, though still looking like 10ppm.