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Old 12/03/2006, 03:23 PM   #1
TekCat
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GFO and GAC in Canister filter (like Randy's)

Randy, you've mentioned that you run GFO and GAC in canister filter. I'd like to do the same since I already have Magnum 350
So, here are some questions:

1) if I drop 150gramm GFO (lets say Phosban) into canister running 350gph, wont it reduce GFO's effectiveness? According to 2LIttleFishes, ~90gph is what's needed.

2) With GAC needed to be changed frequently, do I use the same schedule (lets say 2 weeks) to replace GFO? Or I could use leave it there for longer time?

3) Have you tried and/or recomend to use GFO with ChemiPure? Just because they advertize longer life span vs GAC?

Thanks in advance


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Old 12/04/2006, 04:50 PM   #2
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shameless bump


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Old 12/04/2006, 05:32 PM   #3
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The recommended gph is to keep the granules from bouncing around and grinding up in a loose setting. You can run it faster through a cannister filter. Your change schedule should be based on the effluent coming out. If it starts showing phosphate, change it.


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Old 12/04/2006, 05:38 PM   #4
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Higher flow never hurts the actual binding effectiveness of binders like GFO, but it might grind it to dust if it is moving around too much.

The schedule depends a lot of the level of phosphate concern you have. I use relatively little GFO and change the whole thing only every 2 months or so.


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Old 12/05/2006, 12:09 AM   #5
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Gotcha, thanks.
One more question: 2 month changing for carbon too? I thought that it is supposed to be changed at least once a month otherwise it becomes bad for the tank.


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Old 12/05/2006, 06:30 AM   #6
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I presume that the concern with leaving carbon in a long time is that it may develop a coating of bacteria that may facilitate the conversion of ammonia to nitrate. That might be true, but in my tank nitrate is never a concern as I export plenty of nitrogen via growing macroalgae.

But if you want to avoid that issue, changing it faster can work. I generally recommend 1-2 months on carbon used to reduce organics and yellowing of the water, however.


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Old 12/05/2006, 01:12 PM   #7
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Thanks Randy. Last question, do I just drop GFO in a bag in canister and fill the rest with carbon, or there is a better way?


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Old 12/05/2006, 02:41 PM   #8
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I mix them together and my media holder in the cannister holds it it, but not all will do that, so a bag is OK.


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Old 12/05/2006, 03:02 PM   #9
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Thanks Randy, mixing away


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Old 12/05/2006, 03:40 PM   #10
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Good luck.


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