I run it in a phosban reactor and change it out every 4 weeks. In testing phosphate, I'm of the opinion that the GFO seems to be measurably effective for not much more than a few days, but I'm not willing to change it that often.

I'm estimating the effectiveness by measuring phosphate in the system vs. the outflow from the reactor. If there is a difference, then I assume the GFO is working. That difference seems to exist for only a very short time.

I think my algae is exporting phosphate much more efficiently than my GFO does.

This is interesting.

x2
i second that.

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Visually I found that my tank looks cleaner when I added the GFO, then slowly returns to its natural dirty state.:lol: Your testing sort of backs up my observations.

I don't use it, I find it has negative effects on the different tanks I've tried it on. Poor SPS colour, and when used at full strength I found it almost always immediately triggered RTN or STN.

Yes, The GFO consumption rate is dependant on water flow through the reactor. For my 45g, I fill the TLF reactor 1/3 with GFO, Rowa, whatever, and 1/3rd Carbon. seems to last 4-6 weeks for me. But then, no SPS in this tank so not sure on the SPS effects.

Many of my SPS seemed to improve in color once i began running it, blue coloring emerged from acropora that looked mostly brown before. I went from a phosphate reading of .75 to .01 (Elos test kit) with rowaphos, 40gal weekly water changes, a skimmer rated for nearly twice my system volume, and straining frozen food of packing juice.

i run rowa in one reactor then follow that up with carbon in the 2nd reactor. change every 6 weeks appx

just started using it in my filter