I recently had one tank with very high phosphates (1.0+), and needed to bring it down, so I could combine it with my other tank (zero phosphates) into a single sump. I was using GFO, but it was too slow.
I then got some Foz Down from Tim, and was able to bring it down in a controlled fashion over 3 weeks, so I didn't shock my system too much. It worked, and I was able to combine my tanks without upsetting my other (SPS) tank. I still have to supplement some Foz Down once in a while, as my GFO alone still can't maintain zero phosphates with the combined tanks. I guess there is still some leaching happening.
But Foz Down certainly worked for me, so I can definitely recommend it.
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