PO4 reduction rate

[goslugsgo]

I have a cyano issue and have added GFO to reactively address the present PO4. As of now I have added less than the prescribed amount to the reactor and am planning on increasing as indicated quantitatively through testing and qualitatively through apparent reduction in the amount of cyano.

I don't want to shock the system by dropping it too fast, but I also don't want the process to be drawn out over time. Is there a rule of thumb that indicates a percentage decrease or a numerical testing value for me to follow?

 

[Walter White]

Im not sure of any rule of thumb but I can tell you that on my 60 cube (80g total) I can use 1TBS of BRS GFO and 1/4TBS of SeaChem phosgaurd in the same reactor with my carbon and go from .1 ppm to undetectable inside about 5 days. So dropping anywhere from .02-.03 PPM per day.

 

[Walter White]

I also want to point out that about 1/8th of what BRS recommends If I remember right.

 

[goslugsgo]

Im not sure of any rule of thumb but I can tell you that on my 60 cube (80g total) I can use 1TBS of BRS GFO and 1/4TBS of SeaChem phosgaurd in the same reactor with my carbon and go from .1 ppm to undetectable inside about 5 days. So dropping anywhere from .02-.03 PPM per day.

Thanks TT
One tbs for 60g? My BRS product (not high-capacity) says one tbs per four gallons of water, which is 15 for 60g. I'm not questioning your math, simply saying that I am drastically underestimating the performance!

 

[Walter White]

Right what im saying is don't start with the recommended dosage if that's what you end up using. Most will recommend starting with one half the recommended dosage but I found in my own experience that is still too much. Obviously there are other variables. After all I do combine GFO with phosgaurd. Also I suppose it depends on where you your PO4 is coming from.

There is no way every I would run 8tbs of the BRS GFO in my 60 let lone 15. If you do run the recommended dosage I would definitely use a reactor and only start with 4-6 hours a day and see what that does. This is assuming you haven't started using it already. I would test it daily for sure.

 

[goslugsgo]

Right on. Yeah, I started low, but not that low. I'll keep a close eye and remove as needed.